312 PYRENOCARPEI [STAUROTHELE 



(1803); CarroU in Joum. Bot. iii. p. 292 (1865)? Leight. Lich. 

 Fl. ed. 3, p. 485. 



Differs from tte preceding in the form and development of the 

 thaUus. A specimen in the British Museimi from Dawros River, 

 collected hy Larhalestier and recorded by him under this species, is 

 Vemicaria viridula. 



Hab. On rocks in or near rivers. — Distr. Bare in W. Ireland, 

 Dawros Biver, Connemara, Galway. 



Spores hrown, 4^8 in the ascus. 



4. St. Tupifraga Am. in Verb. K.K. Zool.-Bot. Ges. xxx. 

 p. 149 (1880). — Thallus dark-bluish-grey or whitish, or smoky- 

 brown, tartareous-farinose, effuse, thin, sometimes evanescent 

 Perithecia small, globose, immersed in the rock or emergent, 

 leaving pits, somewhat plane above, the ostiole a minute pore ; 

 perithecial wall entire ; paraphyses disappearing ; spores 4-8 in 

 the ascus, ovoid-oblong, becoming dark-reddish-brown, muriform, 

 0,036-55 mm. long, 0,012—20 mm. thick ; hymenial gelatine 

 wine-red with iodine. — Sagedia calcarea Deakin in Ann. Mag. 

 Nat. Hist. ser. 2, xiii. p. 39, t. 4, fig. 12 (1854)? Polyblastia 

 rwpifraga Ma^sal. Symm. Lich. p. 100 (1855). Vemicaria umhrina 

 var. calcarea Xyl. in Act. Soc. Linn. Bord. ser. 3, i. p. 426 

 (1856) ; Cromb. Lich. Brit. p. 109. V. nipifraga Xyl. ex Cromb. 

 Lich. Brit. p. 109 (1870) ; Leight. Lich. Fl. p. 456 ; ed. 3, p. 488. 

 V. ierehrata Leight. Lich. Fl. p. 456 ; ed. 3, p. 488. Splisti-om- 

 phale terehrata Mudd Man. p. 281 (1861). 



Sometimes the perithecia are so immersed as to be visible merely 

 as minute black points in the stone. The spores are divided into 

 small cells ■svithout any definite transverse septa. 



Hab. On calcareous rocks. — I>istr. Bare in W. England, X. Scot- 

 land and W. Ireland. — B. M. Sapperton, Gloucestershire ; Craig Guie. 

 Braemar. Aberdeenshire ; Kylemore, Connemara, Galway. 



PYRENULACE^. 



ThaUus crustaceous, superficial or developed within the sub- 

 stratum, not corticated. Algal cells Tretitepohlia. Perithecia 

 simple, globose or semi-globose, more or less immersed, opening 

 by a pore at the apex (ostiole). Spermogones small, globose or 

 ovoid, with simple or sparingly branched sterigmata and sper- 

 matia produced apically. 



Distinguished by the yellowish filamentous gonidia (TrentepoliUa), 

 and also by the almost constantly persistent paraphyses. There are 

 eight genera represented in the British Islands : — 



Perithecia scattered. 



Paraphyses branched, entangled or wanting. 

 Asci cylindrical, spores uniseriate. 



Spores 1-septate 112. Acroeordia. 



