76 HEPATIC^. 



6. Radula Carringtonii, Jack. 



Radula Carringtonii, Jack, in " Flora," p. 385 (1881). 



Radula aquilegia, Tayl. var. major, Carrington, Trans. Bot. Soc. Edin. vii. p. 455 

 (1863). 



Dioicous, closely but shallowly coespitose, medium to largish 

 in size, pale or olive-brown colour. Stems closely imbricate, pros- 

 trate, irregularly bipinnate, moderately firm, cortical cells similar 

 to the inner, about 30, inner 5x8, with brownish walls ; branches 

 alternate, somewhat ascending. Leaves slightly imbricate or 

 approximate, patent-divergent to patent 70°-50°, unequally bilobed, 

 margin quite entire ; antical lobe plane or very slightly convex, 

 rotund or subreniform, crossing the stem; postical lobe ^^ 

 smaller, quadrate or trapeziform, outer angle acute, inner margin 

 reaching to about the middle of the stem, plane, appressed to the 

 antical lobe ; texture thin ; cells smallish, hexagonal, walls firm, 

 without trigones. Flowers ? terminal on short lateral branchlets, 

 produced from the pinnse, always subtended by an innovation. 

 Bracts rather larger than the leaves, unequally bilobed, antical lobe 

 turbinate to oblong-oval, apex rotundate, infiexed, postical lobe, 

 about half the size, somewhat similar in shape, apex rotundate. 

 Archegonia 7, 8. Perianth (young) compresso-campanulate, 

 bilabiate, lips retuse. Male plant smaller, irregularly pinnate, 

 branches alternate, short ; androecia on short catkins, produced 

 from main stem ; perigonial bracts 5-10 pairs, closely imbricate, 

 erect, turgid, bilobed to about J or ^, antical lobe oblong-oval, 

 postical rather shorter, oval ; antheridia small, spherical, bearers 

 long. 



Dimensions. — Stems 1 to 2 inches long, with leaves 2" mm. to 

 2*5 mm. wide, diameter of stem -15 mm. to '2 mm., leaves, antical 

 lobe 1*2 mm. x T mm., postical "55 mm. x "5 mm., antical 1"2 mm. 

 X -9 mm., postical '55 mm. x '4 mm., antical 1*5 mm. x 1*1 mm., 

 postical '7 mm. X "5 mm., antical I'l mm. x '8 mm., postical 

 •45 mm. x -35 mm. ; cells "03 mm. x '0225 mm., "0275 mm. x 

 •025 mm., -0275 mm. x '0275 mm., '0225 mm. x '02 mm. ; bracts, 

 antical lobe 1*25 mm. x "9 mm., postical l* mm. x '6 mm. ; male 



