| 词条 | Dendroceros |
| 释义 |
| image = Dendroceros.jpg | image_caption = Dendroceros sp. Nees growing on the bark of a tree | taxon = Dendroceros | authority = Nees in Gottsche, Lindenb. & Nees[1] | subdivision_ranks = Species | subdivision = See text }} Dendroceros is a genus of hornworts in the family Dendrocerotaceae.[2] The genus contains about 51 species native to tropical and sub-tropical regions of the world. DescriptionThe gametophyte is yellowish-green and usually less than one-half cm wide. The thallus branches in a bifurcating pattern. In the subgenus Apoceros, there are cavities in the central strand of the thallus. The edges of the thallus are only a single layer of cells thick and have an undulating margin. It is common to find symbiotic colonies of blue-green bacteria (usually Nostoc) growing among the cells. Under a microscope, the epidermal cells have trigones. The sporophyte is erect when mature, growing up to 5 cm tall. Like other hornworts, its surface has stomata. The interior of the sporophyte differentiates into a central column and a surrounding mass of spores and elater cells, with a distinct spiral. The spores are both green and relatively large with an ornamented surface. HabitatDendroceros grows on humid ground, rocky outcrops, and on the sides of trees. Its name literally means "tree horn". References1. ^{{cite book | last=Gottsche | first=C.M. |author2=Lindenberg, J.B.G. |author3=Nees von Esenbeck, C.G. | year=1846 | title=Synopsis Hepaticarum | page=579 }} 2. ^Renzaglia, Karen S. & Kevin C. Vaughn. (2000) "Anatomy, development and classification of hornworts", pages 1-20 in A. Jonathan Shaw & Bernard Goffinet (Eds.), Bryophyte Biology. (Cambridge: Cambridge University Press). {{ISBN|0-521-66097-1}} External links{{Wikispecies}}{{Taxonbar|from=Q1012912}} 2 : Hornworts|Taxa named by Christian Gottfried Daniel Nees von Esenbeck |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。