50 COLLEMACEI. [cornema. 
Pinchingthorpe, 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. nudum Nyl. Syn.i.(1858) p. 111; Lich. Scand. p. 31.— 
Thallus platyphyllous, lobate, usually naked; otherwise as in the type. 
—Leight. Lich. Fl. ed. 3, p. 20.—Collema crispum var. nudum 
Scher. 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 8. and W. England, the W. and 8. Highlands, Scotland, 
and 8. Ireland.—B. M.: Near Ventnor, Isle of Wight; Torquay, 8. 
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. ec. 
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 walls, rarely on calcareous rocks in mari- 
time and upland situations.— Distr. Local and scarce in S. and 8.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. granuliferum Nyl. Flora, 1875, p. 103.—Thallus imbri- 
cato-laciniate, firm, sprinkled with isidiose globules, dark olive- 
green or blackish, lacinie usually somewhat erect and crowded in 
the centre, beneath often longitudinally and crowdedly 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 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. 
melenum, 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. Sflac- 
cidum, var. microlobum Nyl,, ex Carroll, Journ. Bot. 1868, p. 100, Cromb. 
