44 COLLEMACEI. [COLLEMA. 



it was mixed up with similar species, especially C. granuliferum. It 

 is more likely to be confounded with states of C. ftaccidum, 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 ; East Barnet, 

 Middlesex ; Ditcham and Babbicombe, Devonshire ; near Maryborough, 

 Somersetshire ; Rodmorton and near Cirencester, Gloucestershire : Lud- 

 low, Shropshire; Garregwn rocks, Denbighshire; Rokeby, Durham; 

 Kirov Lonsdale, Westmoreland; near Whitehaven, Cumberland. Appin, 

 Argyleshire ; Killin and Blair Athole, Perthshire. Killarney, co. Kerry. 



Form tunaefonne Nyl. ex Cromb. Journ. Bot. 1874, p. 333. 

 Thalline lobes rather longer, more deeply incised ; otherwise as in 

 the type. Collema tunceforme Sm. Eng. Fl. v. p. 211 ; Mudd, Man. 

 p. 36. Lichen tunaeformis Ach. Prodr. (1798) p. 132 ; Dicks. Crypt, 

 fasc. iv. p. 25. Lichenoides gelatinosum foliis latioribus tumfor- 

 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 (I ) ; lobes flaccid, discrete, round, flexuose, with entire 

 margins. Apothecia moderate, scattered, plane, reddish-brown, the 

 margin thin, entire ; spores ovoid or broadly fusiformi-oblong, 

 3-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 1 Tayl. in Mack. Fl. Hib. ii. p. 110 ; Cromb. 

 Licb. Brit. p. 5 ; Leight. Lich. Fl. p. 25, ed. 3, p. 23.Lathagrium 

 flaccidum Gray, Nat. Arr. i. p. 400. Synechoblastus flacddus Mudd, 

 Man. p. 42. Lichen flacddus Ach. N. Act. Stock, v. (1795) p. 14, 

 t. 1. f. 4. Lichen rupestris With. Arr. ed. 3, iv. p. 76 Brit Exs 

 Leight. n. 345. 



From the preceding, which it resembles, this is distinguished by tho 

 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, Kiugskerswell, and Cockington, 



