LEPTOGIUM | COLLEMACEE 67 
the circumference, sometimes densely isidiose-granulose, dark- 
olive or reddish-black. Apothecia usually numerous, moderate 
in size, concave, becoming somewhat plane, reddish- or dark- 
brown, the thalline margin turgid, entire or sometimes slightly 
granular ; spores oblong-ovoid, 3-septate and muriform, 23-32 p 
long, 10-12 y» thick.—Leight. Lich. Fl. p. 28; ed. 3, p. 33. 
Collema turgidum Ach. Lich. Univ. p. 634 (1810); Hook. in Sm. 
Engl. Fl. v. p. 209; Mudd Man. p. 38. LEnchylium turgiduin 
8S. F. Gray Nat. Arr. i. p. 396 (1821). Collemodium turgidum 
Nyl. ex Lamy in Bull. Soc. Bot. Fr. xxv. p. 342 (1878) ; Cromb. 
in Grevillea xv. p. 12 & Monogr. i. p. 61 (incl. var. depressum, 
a growth form, Cromb. ll. c.). 
Easicc. Leight. n. 257 ; Larb. Lich. Hb. n. 42. 
The smaller firmer lobes and the presence of isidia distinguish this 
species from L. plicatile and Collema pulposum, which have a similar 
habitat. The crowdedly branched appearance is especially noticeable 
in dry plants. Sometimes the thallus (on calcareous stones) is very 
scanty and in scattered lobules. 
Hab. On limestone and brick walls, also on calcareous and creta- 
ceous soil.—Distv. Somewhat rare throughout England, rare in 
S.W. Highlands, Scotland, not recorded from Ireland.—B. M. Near 
Shanklin, I. of Wight; Wadebridge, Cornwall; Plymouth, Devon; 
Tangmere, Lewes, Aldbourne and near Hastings, Sussex; Chelsfield, 
Kent; Reigate Hill and Shiere, Surrey; Chew Magna, near Bristol, 
Cleve Hill and near Yatton, Somerset; Charfield and near Cirencester, 
Gloucestershire; Sevenhampton, Wilts; near Shiffnall, Shropshire ; 
Barrington Hill and Malvern, Worcestershire ; Tetsworth, Oxfordshire ; 
Gorleston, Suffolk; Appin, Argyll. 
4. L. fragile Nyl. in Mém. Soc. Sci. Nat. Cherb. v. p. 333 
(1857).—Thallus small, laciniate or nodulose, the lobes crowded 
in a roughly granular crustose manner or somewhat radiate, 
convex and crenate at the circumference, dark olive-green or 
brown. Apothecia rather rare, minute, concave, becoming plane, 
dark-brown, the margins entire, thickish ; spores ovoid, variously 
septate and muriform, about 29 p long, 13 pw thick.—Cromb. 
Lich. Brit. p. 7; Leight. Lich. Fl. p. 36; ed. 3, p. 27. Collema 
fragile Tay]. in Mackay Fl. Hib. ii. p. 109 (1836); Mudd Man. 
p. 37. Collemodium fragile Nyl. ex Cromb. in Grevillea xv. p. 12 
(1886) & Monogr. i. p. 59. 
The cellular cortex is crushed in cross section and not easily seen. 
In some instances the thallus is like a much stouter L. cretacewm, in 
others the radiating stellate lacinie recall Collema multipartitwm. 
Apothecia are sparingly present. 
Hab. On calcareous rocks in maritime and inland districts.—Distr. 
Rare in 8. and N. England and in 8.W. Ireland.—B. M. Anstey’s 
“Me Torquay, Devon; Barrowmouth, Cumberland; Dunkerron, 
erry. 
5. L. plicatile Nyl. ex Cromb. in Journ. Bot. xii. p. 336 
(1874) (incl. £. minor).—Thallus of thickish upright or spreading 
F 2 
