50 COLLEMACEl. [COIXEMA. 



Pincliingtlioi-pe, Cleveland, Yorkshire ; Kendal, Westmoreland ; near 

 WhiteliaTen, Cumberland. Near Edinburgh; near Glasgow; Appin, 

 Argyleshire ; Killiu, Perthshire ; near Aberdeen ; Fort WiUiam, Inver- 

 ness-shire. Mallow, and near Cork : Tullywhee Bridge, co. Galway. 



Form 1. nudum Xyl. 83-11. i.(lS58) p. Ill ; Lich. Scand. p. 31. — 

 Thallus platyphyUous, lobate, usually naked; otherwise as in the type. 

 — Leight. Lich. Fl. ed. 3, p. 20. — Collema crispum var, nudum 

 Seller. Enum. (1850) p. 25. 



This form is more distinctly and broadly lobed, and but sparingly, if at 

 aU, granulose. The colour of the thaUus and of the apothecia is usually 

 paler. 



Hah. On the mortar of old walls in upland situations. — Distr. Local 

 and scarce in S. and W. Enarland, the W. and S. Highlands, Scotland, 

 and S. Leland. — B. M. : l^ear Ventnor, Isle of Wight ; Torquay, S. 

 Devon ; near Cirencester and Burton-on-the- Water, Gloucestershire ; 

 near Farlow. Shropshire. Appin, Argyleshire : Ben Lawers, Perthshire. 

 Killarney and Dunkerron. co. Kerry. 



Form 2. inonocarpou Xyl. Syn. i. (1858) p. 111. — ThaUus micro- 

 phylline. or nearly obliterated, visible chiefly about the apothecia. — 

 Cromb. Journ. Bot. 1S74, p. 147. — Collema monocarpon Duf. ex 

 Nyl. 1. c. 



The thallus is more or less scattered and microphylline, but often is 

 scarcely visible, except as a granulate margin to the apothecia. lu perfect 

 specimens it is occasionally more developed at the circumference. 



Hah. On the mortar of old walls, rarely on calcareous rocks in mari- 

 time and upland situations.^ — I>istr. Local and scarce in S. and S.W. Eng- 

 land, no doubt overlooked elsewhere. — B. M. : Shanldin, Isle of Wight ; 

 near Hastings, Sussex ; near Cii-encester, Gloucestershire. 



e. Thallus variously laciuiate. 



IG. C. granuliferum Xyl. Flora, 1875, p. 103. — ThaUus imbri- 

 cato-laciniate, firm, sprinkled with isidiose globules, dark olive- 

 green or blackish, laciniae usuaUy somewhat erect and crowded in 

 the centre, beneath often longitudinaUy and crowdedly plicatulo- 

 rugulose when dry. Apothecia moderate, slightly concave or plane, 

 the thaUine margin at length subcrenate, isidiose; spores ovoid, 

 8-septate, sometimes with 1-2 longitudinal septules, 0,024-32 mm. 

 long, 0,008-12 mm. thick. — Cromb. GreviUea, iii. p. 191 ; Leight. 

 Lich. Fl. ed. 3, p. 21. — Collema pul2:)osum var. f/ranulatum Mudd, 

 Man. p. 38. Lichen granulatus pro parte of our older authors. — Brit. 

 Exs. : Larb. Lich. Hb. n. 204. 



In the thallus and the fructification this species is subsimilar to C. 

 inelcenum, but is at once distinguished by the peculiar isidiose globules 

 with which it is sometimes almost entirely covered. A larger and a 

 smaller condition occurs, to the former of which is to be referred C.flac- 

 cidum, var. microhhion Nyl., ex Carroll, Journ. Bot. 1868, p. 100, Cromb. 



