arthopyrenia] pyrenulace-e 325 



20. A. (?) CoUeta A. L. Sm. — Thallus black, thin, continuous. 

 Perithecia black, small, diameter 0*1- "2 mm. in diameter, 

 spherical, at times almost aggregate ; perithecial wall entire ; 

 spores 8 in the ascus, colourless, fusiform, often constricted at 

 the middle, 1-septate, large, 0,032-45 mm. long, 0,010-13 mm. 

 thick ; paraphyses very indistinct ; hymenial gelatine within the 

 asci wine-red with iodine, the rest untinted. — Verrucaria colleta 

 Stirton in Grevillea iii. p. 37 (1874) ; Leight. Lich. Fl. ed. 3, 

 p. 468. Specimen not seen. 



Stirton states that the " gonidia are seen interspersed, having, in 

 many instances, a diameter from 0*016-20 mm., but it is questionable 

 whether they belong to the thallus of this lichen." An aberrant 

 species, possibly a pyrenomycetous fungus. 



Hah. On Gyinnomitrium concinnatum on Ben Lawers. 



Maritime species growing on rocks hy the sea ; spores 

 1- (rarely 3-) septate. 



21. A. litoralis A. L. Sm. — Thallus evanescent. Perithecia 

 minute, black, scattered, prominent, or semi- immersed ; perithecial 

 wall dimidiate or subentire ; paraphyses scanty, distinct ; asci 

 cylindrical or slightly swollen ; spores oblong-ovate, colourless, 

 1-septate, the upper cell sometimes thicker, 0,012—19 mm. long, 

 0,005-7 mm. thick ; hymenial gelatine brown with iodine. — 

 Verrucaria litoralis Tayl. ex Leight. Angioc. Lich. p. 46, t. 20, 

 tig. 2 (1851), & Lich. Fl. p. 440 ; ed. 3, p. 470 (non Tayl. in 

 Hook. Journ. Bot. vi. p. 154 (1847) ) ; Carroll in Journ. Bot. iii. 

 p. 293 (1865); Cromb. Lich. Brit. p. 120. V. consequens Nyl. 

 in Flora xlvii. p. 357 (1864) (fide Wedd. in Mem. Soc. Sci. Nat. 

 Cherb. xix. p. 306 (1875)) ; Jones in Proc. Nat. Hist. Soc. 

 DubHn iv. i. p. 149 (1864). F. suhlitoralis Leight. Lich. Fl. 

 p. 435 (1871); ed. 3, p. 461. 



Hah. On shells or on rocks by the sea. — Distr. Eare in 

 S. England, Wales and S. and N. Ireland. — B. M. Between 

 Seaton and Beer and Mudstone Bay, Brixham, Devon; Goodwick 

 Bay, Manorbeer and Tenby, Pembrokeshire ; Eobin Hood's Bay, 

 Yorkshire ; Ballinahassig, Cork ; Glenarm, Antrim. 



22. A. foveolata A. L. Sm. — Thallus thin, faintly yellowish- 

 green or evanescent. Perithecia minute, black, almost completely 

 immersed, leaving small pits in the substratum ; perithecial wall 

 subentire, black above, brown below ; paraphyses very scanty or 

 wanting, not mucilaginous ; asci cylindrical-clavate, 0,070-80 

 mm. long, 0,017 mm. thick, 8-spored ; spores 1-septate, colour- 

 less, oblong-ovate, thinner at the ends, 0,015-18 mm. long, 

 0,006-7 mm. thick. 



Very near the preceding species in habitat and form of spores, but 

 differing in size and degree of immersion of perithecia. 



Hah. On shells by the sea-shore. — B. M. Eobin Hood's Bay, York- 

 shire (collected by Mr. E. M. Holmes). 



