65 



and narrow nor so regular In arrangement; the seta is thicker, 

 the vaginule shorter in proportion to its thickness and brown- 

 reticulate, more narrowed at top, the spores are darker and more 

 strongly papillose.* The leaves are more crisped when dry, 

 ovate-lanceolate in outline, the hyaline cells of the base are 

 decidedly thicker walled, while those above are thinner walled 

 than in the American plant, more regularly quadrate to roundish 

 hexagonal, not differentiated at border, the papillae are quite 

 different, not projecting so far, generally several (up to 4) per 

 cell on either surface, rather regular and rounded in shape, by 

 their disposal toward the cell-walls leaving the cells apparently 

 less sharply set off than in the American species. The costa is 

 very decidedly weaker, only about 40 ix at base and not so 

 strongly excurrent. In section the costa has normally but two 

 fully included guide-cells with a band of thick-walled stereid 

 cells dorsally but not ventrally, where there is generally a single 

 layer of fairly large thin-walled cells, sometimes a tendency to a 

 second layer. f 



A. kansanum is not the first species to have been added to 

 Lindberg's originally monotypic genus. Limpricht t included 

 with the original species as var. speciosum a form to which an 

 herbarium name Phascum speciosum Moris had been attached 

 and the same was later proposed, though not very seriously, as of 

 specific rank by Fleischer § and apparently accepted as such by 

 Limpricht.il In iQOi'I Broth erus included a second African 

 species, A. aethiopicum (Ephemerum aethiopicum Welwitsch & 

 Duby, 1 871) as having been already assigned to this genus by 

 Lindberg in manuscript. Roth gives later** a description and 

 figure, from which it appears clearly that the plant is specifically 

 distinct from A. carniolicum. At the same time Roth also in- 

 cluded a description and figure of a South American species, 



* Fleischer (1. c.) again mentions variation. 



t Fleischer (1. c.) gives conditions of costa-section more nearly approaching 

 those of A. kansanum. 

 t Op. cit. 196. 1886. 

 § Op. cit. 317. 1893. 

 II Op. cit., Ill, 637. 1901. 



1[ Engler & Prantl, Die natiirlichen Pflanzenfamilien, I, 3, 383. 

 ** Die aussereuropaischen Laubmoose, I, 173; pi. XX, fig. 7. 1911. 



