48 CYCLOCARPINEE [PHYSMA 
in Journ. Bot. vii. p. 234 (1869); Lich. Brit. p. 4 & Monogr. i. 
p. 40; Leight. Lich. Fl. p. 17; ed. 3, p. 16. 
Distinguished from the preceding species by the smaller spores. 
In the British specimens the thallus is also more wide-spreading. 
Hab. Among mosses on old walls.— Distr. Local and scarce in 
W. England.—B. M. Bradley Wood, Newton Bushell, Devon; Coln 
Rogers, Gloucestershire. 
4. Ph. confertum A. L. Sm.—Thallus blackish-brown, com- 
posed of minute turgid squamules. Apothecia numerous, crowded, 
small or moderate in size, the disc reddish, the margin tumid ; 
paraphyses slender ; spores ellipsoid or fusiform-ellipsoid, 17-23 p 
long, 8-10 yp» thick; hymenial gelatine bluish with iodine.— 
Collema turgidum var. confertum Ach. Lich. Univ. p. 634 (1810). 
C. confertum Nyl. in Flora 1. p. 330 (1867); Leight. in Ann. 
Mag. Nat. Hist. ser. 3, xx. p. 259 (1867) & Lich. Fl. p. 18; 
ed. 3, p. 16; Cromb. Lich. Brit. p. 4 & Monogr. i. p. 41. 
I have been unable to verify the character of the spores in the 
single small specimen in the British Museum. 
Hab. Amongst mosses on the ground in a maritime district.— 
B. M. Dunwich, Suffolk. 
24. COLLEMA Wiggs. Prim. Fl. Hols. p. 89 (1780) ; emend. 
A. Zahlbr. in Engler & Prantl Pflanzenf. i. 1*, p. 171 (1906). 
Enchylium 8. F. Gray Nat. Arr. i. p. 396 (1821). (PI. 24.) 
Thallus variously lobed, or squamulose or almost crustaceous, 
swollen and gelatinous when moist, mostly without rhizine, more 
or less appressed to the substratum, non-corticated. Algal 
cells distributed through the thallus (homoiomerous). Apothecia 
with a thalline margin which is sometimes of plectenchyma ; 
hypothecium colourless ; paraphyses simple, mostly septate, and 
conglutinate ; spores 8 in the ascus, fusiform or ellipsoid, 
variously septate and becoming muriform. Spermogones with 
colourless wall and with septate sterigmata and pleurogenous 
minute spermatia. 
The genus Collema, as emended by Zahlbruckner, includes species 
with a non-corticate thallus, and with variously septate muriform 
spores. 
Thallus granular-crustaceous or indistinct. 
1. C. terrulentum Nyl. in Flora lvii. p. 305 (1874).—Thallus 
small, thin, granular, olive-brown or brownish-black. Apothecia 
small, concave, reddish-brown, the thalline margin  thickish, 
entire ; spores ellipsoid or oblong, usually 5-septate and sub- 
muriform, 18-24 p long, 10-12 » thick.—Cromb. in Grevillea iii. 
_ 22 (1874) & in Journ, Bot. xii, p. 333 (1874); Leight. Lich, 
Fl. ed. 3, p. 25. 
