RADULA. 67 



bilobed, postical lobe smaller than the antical, inflexed, producing 

 rootlets. Stipules absent. ? flowers poly^^onous, fruit terminal on 

 short branches or at the base of the fork. Perianth campanulate, 

 compressed or subterete, truncate, mouth dilated. Bracts entire, 

 1-pair, somewhat similar to the leaves, deeply bilobed. Calyptra 

 pyriform, persistent, free, opening below the apex. Pedicel stout, 

 composed of 6 to 8 concentric layers of alternate cells. Capsule 

 oval-cylindricai, dividing to the base into 4 valves. Elaters 

 numerous, long, slender, attenuate at both ends, bispiral, decid- 

 uous. Spores large, globose. Androecia spicate ; perigonia 

 bracts 3-15 pairs, small ; antheridia 1 or 2 (rarely 3) in the ven- 

 tricose base of the bracts. 



1. Radula voluta, Taylor. 

 Radula voluta, Tayl. MS. G.L.N. Syn. Hep. (1844). 



Dioicous, shallowly csespitose, medium size, pale yellow to 

 yellowish-brown. Stems procumbent, pinnately branched. Leaves 

 laxly imbricated, incubous, divergent to patent-divergent, un- 

 equally bilobed, antical lobe broader than high, subrotund, obtuse, 

 quite entire, slightly undulate, crossing the stem, decurrent at its 

 postical base, postical lobe about one-third its size, broader than 

 high, subrotund-cordate, plane, undulate or with margin slightly 

 recurved, crossing the stem, auriculate at the base ; texture some- 

 what flaccid ; cells small, 4-, 5-, or 6-angled, walls moderately 

 thick, without trigones. Androecia on short lateral catkin-like 

 branches, perigonial bracts 3, 4 pairs, closely imbricate, erect, 

 turgid, bilobed, lobes oval, postical rather shorter. 



Female plant not known. 



Dimensions. — Stems 1 to 1|- inches long with leaves 2' to 

 3" mm. wide, diameter '2 mm. to '3 mm. ; leaves, antical lobe 

 1* 6mm. X 1'9 mm., postical lobe "9 mm. x I'nim., antical 1*5 mm. 

 X 1"5 mm., postical "5 mm. x '6 mm., antical Tl mm. x 1"2 mm., 

 postical *5 mm. x '7 mm. ; cells '02 mm. x '02 mm., '02 mm. x 

 •025 mm.; male catkin 3* mm.xl"5 mm., 2*5 mm. x 1'25 

 mm. ; perigonial bracts, antical lobe V2 mm. x "6 mm., postical 



