NOTES ON JAPANESE HEPATIC^E 1 45 



scarcely or not at all decurrent ; leaf-cells plane or nearly so, 

 averaging io/i at the margin of the lobe, 15 /t in the middle and 

 18 fi at the base, walls thin, trigones small but distinct, cuticle 

 on both surfaces very minutely verruculose ; inflorescence dioi- 

 cous ; female inflorescence borne on a leading branch, inno- 

 vating on both sides, the innovations usually simple ; bracts sim- 

 ilar to the leaves, but a little smaller, the lobe measuring 0.75 x 

 0.5 mm. and the lobule 0.45 x 0.25 mm., the latter almost 

 transversely inserted; perianth long-exserted, strongly com- 

 pressed in the upper part, narrowly obovate in outline, 2.5 

 mm. long, 0.9 mm. wide, gradually narrowed to a stalk-like 

 base, broad and truncate above ; mouth shortly two-lipped, 

 entire ; male inflorescence terminating a leading branch, bracts 

 in about three pairs, suberect, strongly inflated, shortly and 

 unequally bifid with rounded divisions ; mature sporophyte not 

 seen. 



Locality, Hono-Kawa, Tosa ; growing mixed with Lejeunese. 

 Collector, Okamura (no. 112), July, 1904. 



Perhaps the most striking features of Radula oyamensis are 

 the strongly convex lobes, the verruculose cuticle and the long 

 and slender perianth. With regard to the peculiarities of the 

 cuticle in this genus, little mention is to be found in the litera- 

 ture, but it is probable that roughened cells occur in other spe- 

 cies. In the genus Scapania, where the cuticle of late has re- 

 ceived a good deal of attention, it has been found that specific 

 characters which are derived from it have to be employed with 

 caution, and it is possible that this same statement will apply to 

 the present genus. 



R. oyamensis belongs to group Tumidae, as defined by 

 Stephani. 1 The original specimens were collected by Dr. C. 

 Gottsche on Mount Oyama, and the species has since been re- 

 ported by Yoshinaga from the province of Iyo. The plant was 

 first described from male material, and no account of the 

 perianth has subsequently appeared. R. lindbergii Gottsche, 

 although placed by Stephani a in his group Communes, bears a 

 certain resemblance to R. oyamensis, the lobes and lobules 



1 Hedwigia 23 : 162. 1SS4. 

 2 L. c. ? 149. 



