COLLEMA. ] COLLEMET. 41 
globose. The apothecia are generally abundant, almost obliterating the 
thallus, and becoming like it blackish when dry. The preceding species 
is intermediate between this and C. chalazanwm. 
Hab.'Among mosses on old walls in shady places in upland districts. 
—Distr. Very local, though plentiful where it occurs in W. England, 
S. Wales, and N.E. Ireland, probably elsewhere overlooked.—B. M.: 
Near Cirencester, Stroud, and Ablington, Gloucestershire; Pembroke- 
shire. Near Belfast, co. Antrim. 
b. Hymenial gelatine bluish with iodine. 
4. C. confertum Nyl. Flora, 1867, p. 330.—Thallus small, 
turgidly squamulose, blackish-brown ; squamules crowded, usually 
cyathoid or podetiiform, almost all fertile. Apothecia small, urceo- 
lato-impressed, one at the summit of each thalline squamule or 
lobule, subconcolorous, the margin tumid; spores ellipsoid or 
fusiformi-ellipsoid, 0,017-23 mm. long, 0,008-10 mm. thick; 
paraphyses slender.— Leight. Ann. Mag. Nat. Hist. ser. 3, xx. 
p. 259; Lich. Fl. p. 18, ed. 3, p. 16; Cromb. Lich. Brit. p. 4; 
Journ. Bot. 1874, p. 333.—Collema turgidum var. confertum Ach. 
L. U. (1810) p. 634. 
The peculiar squamulose thallus and the situation of the apothecia at 
once distinguish this from other British species of Collema. It is allied 
to C. lepideum Nyl., 2 West-African plant, and the two form a distinét 
group, characterized by the thallus and the reaction of the hymenial 
gelatine. No authentic British specimen has been found in recent years; 
and indeed the plant is known only from the original specimen sent by 
Turner to Acharius, and from two fragments in Herb. Kew and Brit. 
Mus. 
Hab. Amongst mosses on the ground in maritime tracts.— Distr. Known 
only from E. England.—B. M.: Dunwich, Suffolk. 
B. EUCOLLEMA Cromb. Journ. Bot. 1874, Tp 
p. 333. — Thallus variously lobed, or 5 
rarely entirely granulose; gonimic con 
granules usually moniliform. Apo- 
thecia lecanorine ; spores septately Fig. 11. 
divided, irregularly murali-locular,  Collema pulposwm Ach. 
ovoid or ellipsoid; hymenial gelatine Six spores, x 500. 
bluish with iodine ; spermogones with 
jointed sterigmata. CREP Ss 
P io) \% 
a. Thallus entirely granulose. Q 
5. C. terrulentum Nyl. Flora, 1874, Staae 
p. 306. — Thallus small, scattered, thin, coxa as Ach. 
granulose, olive-brown or brownish-black. Four spores, x 500. 
Apothecia small, concave, reddish-brown, ; 
the thalline margin thickish, entire; spores ellipsoid or oblong, 
submurali-divided (usually with 5 transverse septa), 0,018-24 mm. 
