44 COLLEMACET, [CoLLEMA. 
it was mixed up with similar species, especially .C. granuliferum. It 
is more likely to be confounded with states of: C. flaccidum, but may 
be readily and certainly recognized by the reaction with iodine in a thin 
section of the thallus. The apothecia become, in old age, convex, dark, 
and immarginate. 
Hab. On rocks and old walls, chiefly calcareous, rarely on the ground 
in maritime and upland tracts.—Distr. Local and rare in Great Britain 
and Ireland.—B. M.: Walthamstow and Ilford, Essex; Hast Barnet, 
Middlesex; Ditcham and Babbicombe, Devonshire; near Marlborough, 
Somersetshire ; Rodmorton and near Cirencester, Gloucestershire ; Lud- 
low, Shropshire; Garregwn rocks, Denbighshire; Rokeby, Durham ; 
Kirby Lonsdale, Westmoreland; near Whitehaven, Cumberland. Appin, 
Argyleshire ; Killin and Blair Athole, Perthshire. Killarney, co. Kerry. 
Form tungforme Nyl. ex Cromb. Journ. Bot. 1874, p. 333.— 
Thalline lobes rather longer, more deeply incised ; otherwise as in 
the type—Collema tuneforme Sm. Eng. Fl. v. p. 211; Mudd, Man. 
p. 86. Lichen tuneformis Ach, Prodr. (1798) p. 132; Dicks. Crypt. 
fasc. iv. p. 25. Lichenoides gelatinosum foliis latioribus tunifor- 
mibus Dill. Muse. 142, t. 19. f. 29 a, B. 
This differs merely in the longer, more deeply incised lobes, which are 
also somewhat rugose. Like the species, it may be either naked or 
granulato-furfuraceous. It is very rare in a fertile condition. 
Hab. On calcareous rocks and walls in maritime and upland situations. 
—Distr. Seen only from W. and N. England, the S.W. Highlands, 
Scotland, and S.W. Ireland.—B. M.: Near Winson, Gloucestershire ; 
Teesdale, Durham. Island of Lismore, Argyleshire. Dunkerron, co. 
Kerry. 
9. C. flaccidum Ach. Syn. (1814) p.322.—Thallus broadly lobed, 
opaque, smoothish or blackish-granulate, dark-green or brownish- 
green ([—); lobes flaccid, discrete, round, flexuose, with entire 
margins. Apothecia moderate, scattered, plane, reddish-brown, the 
margin thin, entire; spores ovoid or broadly fusiformi-oblong, 
“ B3-septate, often becoming 5-septate, 0,023-28 mm. long, 0,007-10 
mm. thick.—Nyl. Syn. i. p. 107; Hook. Fl. Scot. ii. p. 72; Sm. 
Eng. Fl. v. p. 211; Tayl. in Mack. Fl. Hib. ii. p. 110; Cromb. 
Lich. Brit. p. 5; Leight. Lich. Fl. p. 25, ed. 3, p. 23:—Lathagrium 
flaccidum Gray, Nat. Arr. i. p.400. Synechoblustus flaccidus Mudd, 
Man. p. 42. Lichen flaccidus Ach. N. Act. Stock. v. (1795) p. 14, 
t. 1.1.4. Lichen rupestris With. Arr. ed. 3, iv. p. 76.—Brit. Evs.: 
Leight. n. 345. 
From the preceding, which it resembles, this is distinguished by tha 
flaccid thallus, which gives no reaction with iodine. It is generally 
expanded, rather thin, loosely affixed to the substratum, and usually 
sprinkled, or when old nearly covered, on the upper surface with black 
pulverulent granules. The apothecia, which are rare in this country, are 
scattered, and from concave become somewhat convex. 
Hab. On old walls, rocks, and trunks of trees, in shady places in upland 
districts.—Distr. General, and common where it occurs, in Great 
Britain and Ireland.—B. M.: Pyecombe, Sussex; St. Johns, Isle of 
Wight; near Plymstock, East Lyn, Kingskerswell, and Cockington, 
t 
