1 66 Alexander W. Evans, 



Although Stephani attributes a dioicous inflorescence to his 

 species, the type material (which seems to l)e (juite free from admix- 

 ture) is clearly autoicous. The male branches are sparingly pro- 

 duced and are short and simple, rising usually from the basal 

 part of a primary or secondary I^ranch, more rarely from the main 

 axis itself. The inflorescence, which does not proliferate, is 

 mostly 0.2-0.5 "'"^- lo^'i? ^"<^1 about 0.25 wide. The wing is 

 suberect, one cell wide and crenvdate from projecting cells; the 

 antheridia are mostly three to six ; and the openings into the 

 antheridial chambers are usually separated by two rows of cells, 

 rarely by a single row. 



The female branches, so far as observed, are exceedingly short 

 and look as if they were immature. They are in the form of 

 slightly projecting crenulate lobes, each bearing only one or two 

 archegonia on the upper surface. The wings, hardly more than a 

 cell wide, are vaguely crenulate or subentire and are sometimes 

 supplemented by one or two papilla-like cells. According to Ste- 

 phani the "calyptra" may attain a length of 4 mm. and is broadly 

 cylindrical in form ; the surface is roughened by large cells 

 forming papilliform projections, these cells being transformed into 

 hooked hairs in the upper part. 



Gemmae are produced by R. tenerrhna in considerable abun- 

 dance. They are of the two-celled endogenous type characteristic 

 of the genus and are broadly oval in outline, the length being 

 usually 40-50 ,u and the width 30-40 /x. The gemmae are borne 

 on short branches with distinctly crenulate margins and arise in the 

 usual way from cells of the surface-layer. The formation 

 of gemmae quickly limits the growth of the branches. Gemmae 

 are doubtless produced by other Chilean species of Riccardia, but 

 R. tenerrinia is the only one where the writer has observed them. 



The type material of Aneura tenerrhna is fairly abundant and 

 yet gives the impression of being imperfectly developed, owing 

 largely to its great delicacy. Taking this fact into consideration 

 and noting the strong superficial resemblance of the species to 

 R. autoica, the writer was at first inclined to regard it as an aber- 

 rant form of the older species, more especially since both are known 

 from the vicinity of the Aysen River. There are, however, certain 

 differential characters which are clearly sufficient to keep the two 

 species apart. In R. autoica, for example, the thallus shows a 



