50 COLLEMACEI. [COLLEMA. 



Pincliingthorpe, Cleveland, Yorkshire; Kendal, Westmoreland; near 

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

 Argyleshire; Killin, Perthshire ; near Aberdeen; Fort William, Inver- 

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



Form 1. nudumNyl. Syn.i.(1858) p. Ill ; Lich. Scand. p. 31. 

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



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



Schasr. Enum. (1850) p. 25. 



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

 all, granulose. The colour of the thallus and of the apothecia is usually 

 paler. 



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

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

 and S. Ireland. B. M. : Near 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. monocarpon Nyl. Syn. i. (1858) p. 111. Thallus micro- 

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

 Cromb. Journ. Bot. 1874, 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. In perfect 

 specimens it is occasionally more developed at the circumference. 



Hab. On the mortar of old walla, rarely on calcareous rocks in mari- 

 time and upland situations. Distr. Local and scarce in S. and S.W. Eng- 

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

 near Hastings, Sussex ; near Cirencester, Gloucestershire. 



e. Thallus variously laciniate. 



16. C. granulifernm Nyl. Flora, 1875, p. 103. Thallus imbri- 

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

 green or blackish, laciniae usually somewhat erect and crowded in 

 the centre, beneath often longitudinally and crowdcdly plicatulo- 

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

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

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

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

 Lich. Fl. ed. 3, p. 21. Collema pulposum var. granulatum Mudd, 



Man. p. 38. Lichen yranulatiis 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. 

 inelanum, 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- 

 cidttm, var. imcrolobum Nyl., e.c Carroll, Journ. Bot. 1868, p. 100, Cromb. 



