﻿188 • Howe: New American Hepaticae 



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, 75-90/4 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 Michdii Raddi, var. ciliaris Levier (= R. tiimida Lindenb. 

 and R. palmata Lindenb. fide Levier) differs so widely from our 

 species that a detailed comparison is unnecessary. 



R. tricJwcarpa may be found with archegonia and antheridia in 

 January and early February, ripening its capsules in April and May. 

 Like all the Californian Ricciae, it is practically invisible during the 

 summer months. 



It was our first thought to take up for this species the name 



Riccia Bolanderi A 



from the 



Herbarium of the California Academy of Sciences) now in the Un- 

 derwood Herbarium is said originally to have borne, and we have 

 already sent one specimen to Europe under this name. But, in 

 one of the very last of the acute Mr. Austin's works — -his 

 descriptive treatment of the Hepaticae of California, prepared for 

 the "Botany of California, "* but never published — he refers this 

 plant, which he had previously distributed as R. tumida Lindenb. 

 (Hep. Bor-Am. no. 143*') to R. intumescens, raising BischofPs 

 variety of R. ciliata to specific rank, and without making any allu- 

 sion to having at sometime made use of an unpublished name, R- 

 Bolanderi, for the same thing. This reference to R. intumescens 

 would appear to have been Mr. Austin's final opinion in the mat- 

 ter, and under the circumstances it seems to us to be fairer to as- 

 sume the responsibility of the attempt at disentangling this Califor- 

 nian Riccia from its various allies and to give it a name of our own 



choosing. 



Hep. Am. 138, collected in San Mateo Co. by Prof. D. H 

 Campbell, we consider the type of the species. 



* Brewer, Watson, and Gray, Botany of California (Geological Survey of Cali- 

 fornia), 2 vols. 1880. 



