RT info:eu-repo/semantics/article
T1 Vegetative and reproductive morphology of Botryocladia botryoides, B. occidentalis and B. canariensis sp. nov. (Rhodymeniaceae, Rhodophyta) from the Canary Islands
A1 Afonso Carrillo, Julio
A1 Sobrino, Cristina
A2 BotánicaEcología y Fisiología Vegetal
A2 Botánica Marina
AB The type species of Botryocladia, B. botryoides, and B. occidentalis and B. canariensis Afonso-Carrillo & Sobrino sp. nov.,are described in detail from material collected in the Canary Islands. The previously incomplete and partially ambiguousinformation about the vegetative and reproductive morphology of B. botryoides is completed and clarified. Botryocladiabotryoides exhibits as its most relevant attributes arborescent solid axes bearing near-spherical determinate lateral vesicles,vesicle walls consisting of four (to six) cell layers, outer cortical cells loosely arranged forming a near-continuous surfacelayer, one to four secretory cells borne both on unmodified and modified stellate medullary cells, spermatangia cut off fromclosely packed palisade-like spermatangial mother cells, cystocarps incompletely immersed in the vesicle, and tetrasporangiaderived from an inner intercalary cortical cell remaining immersed in the subsurface cortical layer. Occurrence of B. occidentalis in the eastern Atlantic is confirmed. Botryocladia occidentalis differs from B. botryoides mainly by its thinner threelayered vesicle walls and by the fact that its secretory cells are borne exclusively on unmodified medullary cells. Botryocladiacanariensis, known so far only from the Canary Islands, differs from other Botryocladia species by a unique combinationof significant attributes, including a dimorphism in secretory cells (obovoid to pyriform when they occur in small clusterson modified medullary cells, and subspherical when solitary on unmodified medullary cells). It is postulated that the easternAtlantic B. guineensis, the western Atlantic B. ganesanii, and the Indo-Pacific B. skottsbergii are the closest relatives of thenew species. We analyse the features of the type species B. botryoides with the aim of delineating a clear boundary betweenBotryocladia and the next genus Irvinea. The pattern of growth of the vesicles (determinate vs indeterminate) is suggestedas a potentially important diagnostic feature for genus separation.
YR 2003
FD 2003
LK http://riull.ull.es/xmlui/handle/915/27260
UL http://riull.ull.es/xmlui/handle/915/27260
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DS Repositorio institucional de la Universidad de La Laguna
RD 18-mar-2025