The oldest representatives of Cymodoceaceae supposedly arose in the tropical waters of East Gondw... more The oldest representatives of Cymodoceaceae supposedly arose in the tropical waters of East Gondwana inCretaceous and later settled along the World Ocean by various tracks, the most important of which passed along the southern coast of Eurasian continental masses and reached the waters of modern Atlantic. More advanced genera Cymodocea,Syringodium originated in these areas and moved “back” to the waters of the Indian Ocean and the southwestern Pacific.
Nelumbonaceae, along with Proteaceae and Platanaceae, comprise a sister clade to the family Sabia... more Nelumbonaceae, along with Proteaceae and Platanaceae, comprise a sister clade to the family Sabiaceae in the order Proteales, although these families were previously not considered to be related. In this work, we investigated fruitlet development in Nelumbo with a special focus on the principal events of fruitlet ontogenesis and its pericarp histogenesis, aiming to determine whether fruit structure and histology can provide characters supporting current systematic positions and affinities of these families and reveal potential synapomorphies for the order. We demonstrated for the first time that each carpel comprises a biseriate outer and inner epidermis and thick mesophyll with numerous air canals, which differentiate after pollination into a pericarp with a biseriate palisade exocarp and undifferentiated endocarp. The mesocarp differentiated into a protective hard peripheral zone and a soft inner zone. We propose the following additional autapomorphies for Nelumbonaceae: (1) the d...
ABSTRACT The investigation of fruit morphology and pericarp anatomy of the genera Phyllospadix an... more ABSTRACT The investigation of fruit morphology and pericarp anatomy of the genera Phyllospadix and Zostera from the Zosteraceae family enabled us to identify their fruit types based on fruit wall anatomical structure. Drupes of the Prunus type with lignified inner zone of the mesocarp and the endocarp are specific for Phyllospadix iwatensis, whereas in Zostera asiatica dorsally dehiscent follicles of the Myristica type lacking sclerenchyma in the pericarp are found. In addition, Zosteraceae pericarp structure was analyzed and compared with four other families of higher Alismatales: Potamogetonaceae s.l., Posidoniaceae, Ruppiaceae, and Cymodoceaceae. Their exocarp and mesocarp consisted of thin-walled cells and the endocarp comprised a single layer of sclerenchymatous cells. This type of pericarp differentiation is supposed to be the sуnapomorphy of terminal families of Alismatales. The fruits of Zostera and Phyllospadix have a more complex pericarp structure in comparison to the synapomorphic type of pericarp differentiation of higher Alismatales – in Phyllospadix iwatensis both the mesocarp and the endocarp are lignified, whereas in Zostera asiatica the sclerenchyma is lacking. The fruits of Zostera and Phyllospadix are treated as specialised types, and recognised as autapomorphic characters of Zosteraceae among higher Alismatales.
The seed coat anatomy of Wollemia nobilis W. G. Jones, K. D. Hill et J. M. Allen was carried out.... more The seed coat anatomy of Wollemia nobilis W. G. Jones, K. D. Hill et J. M. Allen was carried out. In theresult of analysis of transverse sections of seeds the sufficient parenchymatization of seed coats and their differentiationinto three morphogenetic zones – the exotesta, the mesotesta and the endotesta was revealed. Such characters of thespermoderm as differentiation of the mesotesta into several topographic zones, presence of resin cavities in mesotesta, aswell as the participation of both exotesta and mesotesta in making the wing are treated as the archaic ones. The seeds of W.nobilis are of transitional type between exomesotestal and the exotestal type (according to Corner's typology). In generalthe seed coat structure of W. nobilis fits into the divercity of seed coats structure in the family Araucariaceae and is treatedas a progressive type within the family.
The Zosteraceae family probably originated in the waters corresponding to the present northern pa... more The Zosteraceae family probably originated in the waters corresponding to the present northern part of thePacific and dispersed from there along the northern and southern coasts of Eurasian landmasses, penetrating the waters ofthe Southern Hemisphere at least twice.
Botanical museum of Fund greenhouse in Tsitsin Main Botanical Garden of Russian Science Academy w... more Botanical museum of Fund greenhouse in Tsitsin Main Botanical Garden of Russian Science Academy wasfounded in 1953. The exposition represents botanical objects of tropical and subtropical plants, which were collected inexpeditions to different regions of the World and in the Fund Greenhouse. At the present time museum collection includesabout 500 plant taxa and more than 2000 storage units, significant part of which were brought in Russia for the first timeby Fund Greenhouse staff members. The Botanical museum concept of development is proposed with the aim to increasethe attraction of museum exposition and to create unique social educational center, which will show richness and diversityof the world of plants and increase ecological and botanical knowledge level in wide audience of the museum visitors.When the project of museum renovation will be realized our experience can be shared with other Russian botanicalinstitutions.
Aspidistra minor is described and illustrated as a new species from southern Vietnam (Gia Lai pro... more Aspidistra minor is described and illustrated as a new species from southern Vietnam (Gia Lai province, Kon Chu Rang Nature Reserve). The new species possesses very small ovate to elliptic leaf blades and very small flowers with stamens inserted at the base of the perigone. In flower structure, the new species resembles A. leucographa and A. elatior but strongly differs in shape of leaf blades and position of stamens.
One following the news of systematics of the genus Aspidistra Ker Gawler (1822: 628) should notic... more One following the news of systematics of the genus Aspidistra Ker Gawler (1822: 628) should notice that the year 2016 brought us at least 16 new taxa, including 15 new species and one subspecies (Averyanov & Tillich 2016, Averyanov et al. 2016, Liang et al. 2016, Liu et al. 2016, Ly & Tillich 2016, Pan et al. 2016, Tanaka 2016, Vislobokov 2016, Vislobokov et al. 2016a, 2016b, Zhou et al. 2016). Indeed, Aspidistra is a large and rapidly growing genus which comprises about 160 species, including more than 60 of them known in Vietnam (e.g., Tillich 2005, 2008, 2014, Averyanov & Tillich 2015, 2017, Colin 2015, Vislobokov 2015, 2016, Averyanov et al. 2016, Vislobokov et al. 2016a, 2016b).
The oldest representatives of Cymodoceaceae supposedly arose in the tropical waters of East Gondw... more The oldest representatives of Cymodoceaceae supposedly arose in the tropical waters of East Gondwana inCretaceous and later settled along the World Ocean by various tracks, the most important of which passed along the southern coast of Eurasian continental masses and reached the waters of modern Atlantic. More advanced genera Cymodocea,Syringodium originated in these areas and moved “back” to the waters of the Indian Ocean and the southwestern Pacific.
Nelumbonaceae, along with Proteaceae and Platanaceae, comprise a sister clade to the family Sabia... more Nelumbonaceae, along with Proteaceae and Platanaceae, comprise a sister clade to the family Sabiaceae in the order Proteales, although these families were previously not considered to be related. In this work, we investigated fruitlet development in Nelumbo with a special focus on the principal events of fruitlet ontogenesis and its pericarp histogenesis, aiming to determine whether fruit structure and histology can provide characters supporting current systematic positions and affinities of these families and reveal potential synapomorphies for the order. We demonstrated for the first time that each carpel comprises a biseriate outer and inner epidermis and thick mesophyll with numerous air canals, which differentiate after pollination into a pericarp with a biseriate palisade exocarp and undifferentiated endocarp. The mesocarp differentiated into a protective hard peripheral zone and a soft inner zone. We propose the following additional autapomorphies for Nelumbonaceae: (1) the d...
ABSTRACT The investigation of fruit morphology and pericarp anatomy of the genera Phyllospadix an... more ABSTRACT The investigation of fruit morphology and pericarp anatomy of the genera Phyllospadix and Zostera from the Zosteraceae family enabled us to identify their fruit types based on fruit wall anatomical structure. Drupes of the Prunus type with lignified inner zone of the mesocarp and the endocarp are specific for Phyllospadix iwatensis, whereas in Zostera asiatica dorsally dehiscent follicles of the Myristica type lacking sclerenchyma in the pericarp are found. In addition, Zosteraceae pericarp structure was analyzed and compared with four other families of higher Alismatales: Potamogetonaceae s.l., Posidoniaceae, Ruppiaceae, and Cymodoceaceae. Their exocarp and mesocarp consisted of thin-walled cells and the endocarp comprised a single layer of sclerenchymatous cells. This type of pericarp differentiation is supposed to be the sуnapomorphy of terminal families of Alismatales. The fruits of Zostera and Phyllospadix have a more complex pericarp structure in comparison to the synapomorphic type of pericarp differentiation of higher Alismatales – in Phyllospadix iwatensis both the mesocarp and the endocarp are lignified, whereas in Zostera asiatica the sclerenchyma is lacking. The fruits of Zostera and Phyllospadix are treated as specialised types, and recognised as autapomorphic characters of Zosteraceae among higher Alismatales.
The seed coat anatomy of Wollemia nobilis W. G. Jones, K. D. Hill et J. M. Allen was carried out.... more The seed coat anatomy of Wollemia nobilis W. G. Jones, K. D. Hill et J. M. Allen was carried out. In theresult of analysis of transverse sections of seeds the sufficient parenchymatization of seed coats and their differentiationinto three morphogenetic zones – the exotesta, the mesotesta and the endotesta was revealed. Such characters of thespermoderm as differentiation of the mesotesta into several topographic zones, presence of resin cavities in mesotesta, aswell as the participation of both exotesta and mesotesta in making the wing are treated as the archaic ones. The seeds of W.nobilis are of transitional type between exomesotestal and the exotestal type (according to Corner's typology). In generalthe seed coat structure of W. nobilis fits into the divercity of seed coats structure in the family Araucariaceae and is treatedas a progressive type within the family.
The Zosteraceae family probably originated in the waters corresponding to the present northern pa... more The Zosteraceae family probably originated in the waters corresponding to the present northern part of thePacific and dispersed from there along the northern and southern coasts of Eurasian landmasses, penetrating the waters ofthe Southern Hemisphere at least twice.
Botanical museum of Fund greenhouse in Tsitsin Main Botanical Garden of Russian Science Academy w... more Botanical museum of Fund greenhouse in Tsitsin Main Botanical Garden of Russian Science Academy wasfounded in 1953. The exposition represents botanical objects of tropical and subtropical plants, which were collected inexpeditions to different regions of the World and in the Fund Greenhouse. At the present time museum collection includesabout 500 plant taxa and more than 2000 storage units, significant part of which were brought in Russia for the first timeby Fund Greenhouse staff members. The Botanical museum concept of development is proposed with the aim to increasethe attraction of museum exposition and to create unique social educational center, which will show richness and diversityof the world of plants and increase ecological and botanical knowledge level in wide audience of the museum visitors.When the project of museum renovation will be realized our experience can be shared with other Russian botanicalinstitutions.
Aspidistra minor is described and illustrated as a new species from southern Vietnam (Gia Lai pro... more Aspidistra minor is described and illustrated as a new species from southern Vietnam (Gia Lai province, Kon Chu Rang Nature Reserve). The new species possesses very small ovate to elliptic leaf blades and very small flowers with stamens inserted at the base of the perigone. In flower structure, the new species resembles A. leucographa and A. elatior but strongly differs in shape of leaf blades and position of stamens.
One following the news of systematics of the genus Aspidistra Ker Gawler (1822: 628) should notic... more One following the news of systematics of the genus Aspidistra Ker Gawler (1822: 628) should notice that the year 2016 brought us at least 16 new taxa, including 15 new species and one subspecies (Averyanov & Tillich 2016, Averyanov et al. 2016, Liang et al. 2016, Liu et al. 2016, Ly & Tillich 2016, Pan et al. 2016, Tanaka 2016, Vislobokov 2016, Vislobokov et al. 2016a, 2016b, Zhou et al. 2016). Indeed, Aspidistra is a large and rapidly growing genus which comprises about 160 species, including more than 60 of them known in Vietnam (e.g., Tillich 2005, 2008, 2014, Averyanov & Tillich 2015, 2017, Colin 2015, Vislobokov 2015, 2016, Averyanov et al. 2016, Vislobokov et al. 2016a, 2016b).
Uploads
Papers by Mikhail Romanov