Endogemma

Endogemma caespiticia has obliquely, and irregularly tetragonal (7 sided) in projection. They are about 8.4–14.0 × 7.0–10 μm in size. They are 2 celled at leaf tips or margins. They are found within unfertilized perianth. The sexual condition is dioicous. The perianth is present, without perigynium (sac) or shoot calyptra (lid). ==Distribution==

They are a boreal sub-circumpolar species. It is native to Eurasia and Northern America. It is widespread in northern Europe. It has been recorded in all administrative sub-units of the Russian Far East (although it is very rare in altitudes northward of 60°N). In adjacent Siberia, it is distributed disjunctively and also known from Western and Southern Siberia and the Republic of Yakutiya. On the North American side, it seems to be quite rare and is recorded only in British Columbia and Alaska and also eastward also known from rather isolated locality near New York. ==Habitat==

It is an Acido- to neutrophilic mesophyte. It has a preference to grow in man-made mesic habitats, such as near roadsides and waste lands. The taxon also prefers habitats with anthropogenic disturbed vegetation. Such as on claylike soil along roadsides and on stream banks in coniferous forest belt, rarely ascending to alpine forests and mountain tundra or occurring within the tundra zone. In the Russian Far East, it occurs mostly below 500 m a.s.l., with rare exceptions confined to anthropogenically modified habitats such as in Iturup Island (1020 m a.s.l.), where it occurs along old roadside and also Central Kamchatka, where it grows along stream banks and near roads. ==References==