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霉草科(Triuridaceae)-中国大陆分布新记录科 总被引:4,自引:1,他引:3
报道中国大陆霉草科(Triuridaceae)2种分布新记录,大柱霉草(Sciapila megastyla Fukuyama et Suzuki)和多枝霉草(Sciaphila ramosa Fukuyama et Suzuki)。 相似文献
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Pollen and tapetal characters in the mycoheterotrophic monocot family Triuridaceae are here compared with those of their
putative relatives, including the lilioid order Pandanales (Pandanaceae, Cyclanthaceae, Velloziaceae and Stemonaceae), with
which Triuridaceae have recently been associated following analyses of molecular data. Triuridaceae have small, inaperturate
(functionally monoaperturate) pollen grains with the exine reduced to gemmae which have distinctive protruberances or spines.
Microsporogenesis is of the successive type. Some genera have a plasmodial tapetum. Orbicules are absent. These characters
are compatible with a relationship with Pandanaceae, but a relationship with Alismatales, as suggested by earlier authors,
cannot be excluded.
Received June 18, 2002; accepted July 22, 2002 Published online: November 22, 2002
Address of the authors: Carol A. Furness (e-mail: c.furness@rbgkew.org.uk), Paula J. Rudall and Alison Eastman, Royal Botanic
Gardens, Kew, Richmond, Surrey, TW9 3AB, UK. 相似文献
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在近期缅甸北部的植物考察中,一种菌类寄生植物矮生喜荫草(Sciaphila nana Blume)被发现和确认。矮生喜荫草代表缅甸被子植物一新记录科,霉草科植物。矮生喜荫草主要特征为花单性同株、雄花内轮花被片顶端具有柄的门把状物、花被片6、3个雄蕊、花药4室。 相似文献
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A new species ofTriuridopsis (Triuridaceae) is described. It shows a number of similarities to the genusTriuris. This is the first record of the family for Bolivia. 相似文献
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Vázquez-Santana S Engleman E Martínez-Mena A Márquez-Guzmán J 《American journal of botany》1998,85(3):299-304
Ovule and seed development is described for Lacandonia schismatica, a species whose androecium is surrounded by the gynoecium. The ovule in each carpel is basal, anatropous, tenuinucellate, and bitegmic. The female gametophyte is formed by the micropylar megaspore cell, after a coenocytic stage of the four megaspore nuclei. The mature female gametophyte has the normal complement of seven cells and eight nuclei. We propose a new type of female gametophyte development on the basis of the coenocytic stage of the tetrad, the cellularization of the tetrad, and the survival of the micropylar spore. At seed dispersal time, the embryo has ~10-20 cells. Endosperm development is of the nuclear type. At maturity, endosperm cells show starch and protein inclusions as well as polysaccharides in their thick walls. The seed coat is formed from the outer integument; the inner one disappears. The exotesta contains tannin. The fruit (achene) wall is two-layered. The maturation of the fruits in a flower is synchronous, and they separate from the receptacle for dispersal. 相似文献
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