82 JUNGERMANNIACEAE 
markings are extremely variable, and it is possible that two or 
more species should be recognized in the Californian specimens, 
but we have been unable to draw separating lines in any satisfac- 
tory way. The difference between a purely and rather remotely 
cristate spore like that represented in our figure 18 and one in which 
the crests are nearly all replaced by narrow spines, very numerous 
and densely crowded in the basilar circumference, like that shown 
in fig. 20, is very striking, but forms that seem to be intermediate 
exist, as is shown by our other figures. It is worthy of remark 
that the spores (fig. 17) of the specimen “ex herb. С. Е. Austin,” 
alluded to above, bear more spines than crests ; the spines are here 
somewhat shorter than in specimens from the southern part of the 
state [Pasadena (McClatchie); San Bernardino Co. (Parish)]. АШ 
the specimens that we have seen from stations north of San Fran- 
cisco have spores of the purely cristate type, having, on the whole, 
more in common with the spores of F. pusilla than with those of 
Е. Wondraczeki. 
PLATE 99. 
16-20. Fossombronia longiseta Aust. Spores, 305. 
16. From Clarendon Heights, San Francisco, Mar. 28, 1896. 
5 7. From specimen in herb. Underwood marked <“ California, ex herb. С. Е. Aus- 
tin, comm. О. D. Allen." 
18. From Mill Valley, Marin Co., Apr. 
pr. 4, 1896. 
19. From specimen in herb. Underwood, marked << San Francisco, Cal., coll. Т. 
S. Вгапдерее.'' 
20. From Pasadena ( A. J. McClatchie). 
Family IV. JUNGERMANNIACEAE. 
* А 
thi “Та three exotic genera, there is a prominent thalloid or filamentous phase, = 
Per мо of the cases, at least, is doubtless to be homologized with the protonem? 
5. than with the gametophore. In all, the branches bearing the sexual organs = 
