PHYSCTA. ] PHYSCIET. 301 
to be regarded as distinct, on account of its manner of growth, its being 
much smaller in all its parts, and the absence of transition forms, It is 
not very common in a fertile condition; but the apothecia when present 
are numerous. 
Hab. On rocks, walls, old pales, and the trunks of trees in maritime 
and upland districts—Distr. Rather local and not common in Great 
Britain; apparently rare in N. Ireland—B.M.: Hay Tor, Dartmoor, 
Devonshire; near Penzance and St. Austell, Cornwall; Windsor Park, 
Berkshire; Wheatfield Park, Oxfordshire; Colwall, Herefordshire ; 
Malvern, Worcestershire; near Shrewsbury, Shropshire; Aberdovey, 
Merionethshire. Lawers, Killin, Perthshire; Findhaven Hill, Forfar- 
shire; Durris, Kincardineshire ; Lairg, Sutherlandshire. Co. Antrim. 
Form perfusa Nyl. ew Lamy Bull. Soc. Bot. t. xxv. (1878) p. 382. 
—Thallus smaller, widely expanded, densely stipate. Apothecia 
moderate. 
As stated by M. Lamy, J. ¢,, this has the appearance of a granular 
crust, though composed of minute, very crowded, thalline lacinie. Our 
British specimens are well fertile. 
Hab. On granitic walls of gardens and houses in maritime and upland 
situations—Distr. Local, in N.E. Scotland and among the N. Grampians. 
—B. M.: Portlethen, Kincardineshire; Crathie, Braemar, Aberdeen- 
~ shire. 
Var. B. pygmea Nyl. Lich. Scand. (1861) p. 108.—Thallus 
small, determinate; lacinie erect, narrowly divided, often almost 
rounded, the margin usually granuloso-pulverulent. Apothecia 
moderate; spores 0,010-14 mm. long, 0,007-9 mm. thick.— Bor- 
rera pygmeea Bory in Fr. Lich. Eur. (1831) p. 73. 
Well distinguished from the type, with which, however, it is confluent 
through intermediate stages, by the very much smaller (almost minute) 
thallus, and by the nearly rounded laciniz. The thallus in our specimens 
is in small, discrete nodules, and the apothecia, which are numerous, are 
somewhat large in proportion to the size of the plant. 
Hab. On exposed granitic walls in an upland district.—Distr, Extremely 
local and scarce, among the 8. Grampians, Scotland.—B. M.: Ben Lawers, 
Perthshire. 
B. CINERASCENTES.—Thallus greyish or whitish, rarely brown. 
Apothecia brownish or blackish ; spores 1-septate, brown or 
dark-brown ; spermogones black, with spermatia cylindrical or 
slightly thickened at either apex, rarely acicular.—Huphyscia 
Cromb. Grevillea, xv. (1887) p. 78. 
a. Spermogones with cylindrical or subcylindrical spermatia. 
6. P. intricata Scher. Enum. (1850) p. 11.—Thallus expanded, 
cxspitose, suberect, roundly compressed, laciniate, densely puberulo- 
villose, greyish-glaucous or greyish-brown ; beneath greyish-white, 
subcanaliculate ; lacinie divaricately branched, very much en- 
tangled(K_,CaCl_). Apotheoia lateral, sessile, moderate, plane or 
