COLLEMA | COLLEMACE: 49 
An easily overlooked plant; possibly a reduced form of some other 
species. The only specimen gathered occurred in small scattered 
masses, most of which were sterile. 
Hab. On the bark of an old ash-tree-—B. M. Shores of Loch 
Katrine, Perthshire. 
2. C. isidioides Nyl. ex Arn. in Flora liii. p. 232 (1870).— 
Thallus of isidia-like granules in crowded groups, blackish. 
Fructification unknown.—Nyl. in Flora Ixvi. p. 98 (1883). 
Cromb. in Journ. Bot. xxiii. p. 195 (1885). Specimen not seen. 
First collected by Arnold in the Bavarian Alps; of uncertain 
position in the absence of all fructification. 
Hab. On calcareous rocks in mountainous districts (Warton 
Craig, Westmoreland). 
3. C. glaucescens Hoftm. Deutschl. Fl. ii. p. 100 (1795).— 
Thallus thin, appressed, dull- or dark-olivaceous-green, indistinctly 
lobate, the lobes small, round or oblong, contiguous or scattered, 
entire or slightly crenate, scarcely noticeable when dry. Apo- 
thecia moderate in size, appressed, plane, reddish-brown or red, 
with a thin scarcely prominent entire or slightly crenate margin ; 
paraphyses stoutish ; spores usually 4 or 6 in the ascus, ovoid, 
4—5-septate, with one or more longitudinal septa, 27—38 p long, 
14-16 » thick.—Cromb. in Grevillea xy. p. 11 (1886). C. limosum 
Ach. ex Borr. in Engl. Bot. Suppl. t. 2704, fig. 1 (1831) ; Hook. 
in Sm. Engl. FI. v. p. 208; Tayl. in Mackay Fl. Hib. ii. p. 108; 
Cromb. Lich. Brit. p. 4; Leight. Lich. Fl. p. 21; ed. 3, p. 19. 
C. pulposum var. limosum Mudd Man. p. 39 (1861). 
Readily recognized by the agglutinate thallus, with small almost 
granular lobes. The spores are larger with more definite longitudinal 
septa than those of the preceding species. The thallus is sometimes 
evanescent, when the plant may easily be overlooked. 
Hab. On moist clay soil in maritime and inland tracts.—Distr. 
Rare in S.W. and E. and N. England, and in the W. Highlands, 
Scotland.—B. M. Hassocks and Albourne, Sussex; Croham Quarry, 
Kent; Bocking, Essex; Wootton-under-Edge and near Cirencester, 
Gloucestershire ; Bulstrode, Bucks; Hawford and Norton, Worcester- 
shire; Buxton, Derbyshire; near Ayton, Cleveland, Yorkshire ; Speke, 
oo Milnthorpe, Westmoreland; Fort Augustus, Inverness- 
shire. 
Thallus lobes crowded, erect, coralloid or proliferous. 
4. C. ceraniscum Nyl. in Flora xlviii. p. 353 (1865).— 
Thallus small, the lobes minute, erect, coralloid, obtuse and 
nodulose at the apices, congested in small compact cushion-like 
masses, dark olive-greenish or olive-brown (I + wine-red in 
section). Apothecia minute, somewhat concave, brownish-red 
or black, the thalline margin thin, entire ; spores usually 4 (some- 
times 8) in the ascus, oblong-ellipsoid, blunt at the ends, 
2-6 septate, irregularly and very distinctly muriform, 27-34 p 
I. E 
