; 38 COLLEJJACEI. [sYNALISSA. 



S intricata Nyl. Flora, 1883, p. 534. Thallus effuse, fruti- 

 culose,' radiate, laciniato-multifid, pitch-black, lacing rounded, 

 intricate, narrow, somewhat obtuse or slightly nodulose at the 

 apices : apothecia not seen. Cromb. Journ. Bot. 1886, p. lito. 

 Omphalaria intricata Arn. Flora, 1869, p. 254. 



This peculiar plant was referred by Nylander to Nematonostoc (Flora, 

 1883 p 104) : he afterwards placed it in this genus with which it agrees 

 in 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 Nylander proposes to term Synahssma. It may readily be 

 known by the radiate thallus, giving it the aspect of a Pterygmm. Ihe 

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

 specimens are not uncommon. 



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

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

 Black Craig, New Galloway, Kirkcudbrightshire. 



13. SCHIZOMA Nyl. ex Cromb. Grevillea, 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- 

 bacillar. (Nyl. in litt.) 



This approaches in the structure of the thallus to 

 Collemoditim, from which it differs in the tenuity 

 of the tubules in the nearly obliterated cavity. 

 This character and that of the spermogones en- 

 title it to rank as a distinct genus ; though only 

 the discovery of the apothecia would definitely Fig. 9. 



determine its place in the family, which is pro- Schizoma lichiiwdeum 



bably between Omphalaria and Colkma. The Nyl. a. Section of 



gonimia are with difficulty expelled from the cells thaflus/x 200. b. 

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



matia. 



1. S. lichinodeum Nyl. ex Cromb. Grevillea, v. p. 108, note. 

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

 laciniae 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 licUnodeum Nyl. 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 lacinise slightly suberect 



