Кіссіл 19 
Bisch, known to us only from the excellent figures and descrip- 
tion of its author and from a specimen communicated by Herr M. 
Heeg, our plant differs in the longer, narrower segments, in the 
shorter and even more crowded lateral setae, those toward the 
apex often in as many as 8-12 irregular series, and in the normal 
presence of 1-12 long trichomes above each sporogonium, while 
іп A. ciliata intumescens, the “cilia” appear to be of somewhat 
rare occurrence on the dorsal surface. In А. ciliata, the tissues 
covering the mature sporogonium soon become thin, scarious, and 
shining, and finally break away in fragments, exposing the capsule 
and the spores, and Bischoff* remarks of the capsules of the var. 
intumescens: “post maturitatem rupti, foveolas sports repletas in 
frondis pagina superiore relinquentes" ; while in А. trichocarpa the 
covering of the capsules remains very long intact—indeed, in only 
one case out of several specimens with spores evidently much past 
maturity, have we seen the contents of a capsule exposed by nat- 
ural agencies. 
Riccia crinita Tayl. from Swan River. Australia (Drummond, 
no. 42), the original of which we have seen through the kindness 
of Dr. В. L. Robinson, is close to Ж. trichocarpa in character and 
number of setae, which also sometimes occur over the sporogonia, 
But А. crinita is a smaller plant, only 2 or 3 times dichotomous, 
with shorter, oblong rather than linear segments, the thallus is 
comparatively much thinner, the vertical sections of its segments 
being 3-7 times as wide as high, the margins are acute and com- 
monly incurved ; the spores (possibly not arrived at full depth of 
color) are light-brown, 75—90 м in maximum diameter, with 11—14 
smaller areolae across the convex face, this scarcely papillate in 
profile, the plane faces similarly areolate, the mesh-forming ridges 
throughout and the narrow margin nearly smooth. 
Riccia Мілей Raddi, var. ciliaris Levier (= А. tumida Lindenb. 
and Ж. palmata Lindenb. fide Levier) differs so widely from our 
species that a detailed comparison is unnecessary 
R. trichocarpa may be found with archegonia and antheridia in 
January and early February, ripening its capsules in April and 
May. Like all the Californian Riécciae it is practically invisible 
during the summer months. 
* Acta Acad. Caes. Leop.-Carol. Nat. Cur. 17: 1063. 1835. 
