38 COLLEMACEI. [SYXALISSA. 



2. S. intricata Xvl. Flora, 18S3, p. 534.— Thallus effuse, fruti- 

 culose, radiate, laciniato-imiltifid, pitch-black, laciniiB rounded, 

 intricate, narrow, somewhat obtuse or slightly nodulose at the 

 apices : apothecia not seen. — Cromb. Jouni* Bot. 1885, p. 195. — 

 Omphalaria intincata Am. Flora, 1869, p. 254. 



This peculiar plant was refen-ed bv Nvlander to Xrmatonostoc (Flora, 

 1883, p. 104) ; he afterwards placed it in "this genus with which it aorees 

 iu the character of the spermogones. At the same time the gonimia 

 are hormogonimia and not speirogonimia, and so it may be a distinct 

 genus, which Xylander proposes to term Synali.ssina. It may readily be 

 known by the radiate thallus, giving it the aspect of a Pfen/f/ium. The 

 apothecia have not been discovered, but the spermogones in the British 

 specimens are not uncommon. 



Hab. On moist granitic rocks in upland hilly districts. — Bistr. Ex- 

 tremelv local and rare, having been gathered only in S. Scotland. — B. M.: 

 Black Craig, New Galloway, Kii-kcudbrightshire. 



13. SCHIZOMA Xyl. ex Cromb. GreviUea, v. (1877) p. 108 (note). 



— Thallus lineari-laciniate, internally at length 

 composed of a firm gelatine, through which run 

 thin, short, frequent tubules variously arranged, 

 but chiefly longitudinally : gonimia nearly mo- 

 derate, in subrotund cells, situated chiefly 

 under either surface, but also sparingly seen 

 smaller and scattered. Apothecia unknown. 

 Spermogones innate, or indicated externally by 

 a somewhat prominent thalline ostiole ; sterig- 

 mata subsimple : spermatia minute, pistillari- 

 baciUar. (Xyl. in lift.) 



This approaches in the structure of the thallus to 

 CoUemodium, from which it differs in the tenuity 

 of the tubules in the nearly obUterated cavity. 

 Tliis character and that of the spermogones en- 

 title it to rank as a distinct genus ; though only 

 the discovery of the apothecia would detinitely Fig. 9. 



determine its place in the family, which is pro- Schhwna lichhwdeim 

 bably between Omphalaria and C'oUema. The Njl. — a. Section of 

 gonimia are with difficulty expelled from the cells thallus, x 200. h. 

 so as to be seen free. Sterigmata. c. Sper- 



matia. 



1. S. lichinodeum Xyl. ex Cromb. GreviUea, v. p. 108, note. — 

 Thallus small, loosely adnate, lineari-laciniose, brownish-black, 

 laciniai plane or subcanaliculate, Ligulate, simple or more frequently 

 2-3-divided, obtuse at the apices, naked, or sometimes sprinkled 

 with concolorous isidiose globules. Apothecia not yet seen. — 

 Collema Uchinodeum Xyl. Flora, 1869, p. 293 ; Carroll, Journ. Bot. 

 iii. p. 287 : Cromb. Lich. Brit. p. 3 ; Leight. Lich. Fl. p. 18, ed. 3, 

 p. 15 ; Cromb. Journ. Bot. 1874, p. 332. 



The thallus is normally orbicular, with the lacinire slightly suberect 



