COLLEMODIUM.'J COLLEMEI. (II 



shire ; Malham Cove, Yorkshire. Boniiiiiglon Falls, near Ijanark ; near 

 Leveu, Fife-shire ; River Isla, near Rutiiven WdocI and Lochearn, Perth- 

 shire. Ardtully, Kenmarc, co. Kerry. 



6. C. glebulentum Nyl. ex Cromb. Grevillea, xv. (1886) p. 12. 

 — Thallus effuse, thickly isidiose, glomuIoso-difFract, sublobate, aud 

 membranaceous at the circumference, olive-brown or blackish ; lobes 

 very small, subentire or lacerate at the margins. Apothecia and 

 spermogones unknown. — Leptogium glebulentum N'yl. Cromb. Journ. 

 Bot. 1882, p. 272. 



A peculiar plant externally diverse, but nearly allied to the pre- 

 ceding. The thallus is rather thin, except where it is covered with the 

 jiTanuloso-crustose isidia, by which it is almost obliterated, unless at the 

 cii-cumference. Apothecia and spermogones are absent in the few speci- 

 mens seen. 



Hab. On moist limestone rocks in subalpine and alpine localities. — 

 Distr. In S. and N. Grampians, Scotland, rare. — B. M. : Above Loch- 

 ua-Gat, Ben Lawers, Perthshire; Craig Guie, Braemar, Aberdeenshire. 



7. C. turgidum Xyl. ex Lamy, Bull. Soc. Bot. Fr. t. xxv. (1878) 

 p, 342. — Thallus thickish, roundly lobed, naked or granulate, dark- 

 olive or reddish-black ; lobes turgid, rugulose, ascending and some- 

 what imbricate in the centre, concave and undulato-plicate at the 

 circumference. Apothecia moderate, urceolate or at length some- 

 what plane, reddish-brown or dark-brown, the thalline margin 

 turgid, more or less granulate: spores oblongo- ovoid, 3-scptate and 

 murali-locular, 0,023-32 mm. long, 0,010-12 mm. thick. — Lepto- 

 togium Uirgidum Xyl. Cromb. Lich. Brit. p. 10 ; Leight. Lich. Fl. 

 p. 28, ed. 3, p. 33. Collcma turgidum Ach. Lich. Univ. (1810) 

 p. 634 ; 8m. Eng. Fl. v. p. 209 ; :\rudd, Man. p. 'dS.—Brit. Exs. : 

 Leight. n. 257 ; Larb. Lich. Hb. n. 42. 



From all states of Colkma ptilposum or Colkmodium plicatile this is 

 distinguished hy the peculiar sublobato-fruticulose thallus, Avhich when 

 dry appears as if minutely venucfefonui-lobed. The apothecia, which 

 are sessile and normally urceolate, are usually numerous. 



Hah. On limestone and brick walls, also on calcareous and cretaceous 

 soil, in upland tracts. — Distr. General, though nowhere common, through- 

 out England, rare in the S.W. Highlands of Scotland, not seen from Ire- 

 land. — B. M. : Dunwich, Suffolk ; Chelsfield, Kent ; Pieigate Hill and 

 Shiere, Surrey ; near Hastings, Sussex ; Shauklin, Isle of Wight ; Ply- 

 mouth, Devonshire ; Wadebridge, Cornwall ; Chew Magna, near Bristol, 

 Somersetshire ; Charheld, Gloucestershire ; Seveuhamptun, Wiltshire ; 

 Barriugton Hill and Malvern, Worcestershire ; Tetsworth, Oxfordshire ; 

 near Shiffiial, Shropshire. Appin, Argyleshire. 



Var. ft. depressTiin Cromb. GreviUea, xv. (1886) p. 12. — ThaUus 

 depressed, somewhat rosulate, very small, much scattered. Apothecia 

 minute. 



This peculiar variety evidently depends upon the nature of the habitat, 

 aud is ])n>bably a starved form uf the type. ^VUhough the thallus is 

 little developed, the apothecia are rather numerous. 



