PILOPHORUS. | PILOPHOREL. 115 
white; podetia short, erect, simple, verrucoso-granulate or sub- 
pulverulent (K+yellowish). Apothecia small, subglobose, para- 
physes thickish ; spores ellipsoideo-fusiform, 0,016-0,022 mm. long, 
0,004-0,005 mm. thick.—Cromb. Grevillea, xv. p. 15.—Stereocaulon 
cereolus Ach. Meth. p. 316; Borr. in Engl. Bot., Suppl. t. 2667. 
S. cereolinum Sm. Eng. Fl. v. p. 233 pro parte; Tayl. in Mack. Fl. 
Hib. ii. p. 83. Lechen (Istdiwm) cereolus Ach. Prodr. (1798) p. 89. 
Stereocaulon condensatum var. cereolinum Ach. pro parte, Cromb. 
Lich. Brit. p. 17 pro parte. To this also belongs P. fibula (non 
Tuck.) Leight. Ann. Mag. Nat. Hist. 1869, vol. iv. p. 201; Lich. FI. 
p. 76, ed. 3, p. 69 pro parte-—Brit. Eus.: Leight. n. 383; Larbal. 
Lich. Hb. n. 5. 
When sterile, this closely resembles Stereocaulon pileatum, from which, 
when fertile, it is easily distinguished by the simple spores. The basal 
thallus is normally granuloso-diffract, sometimes becoming more or less 
pulveraceo-delitescent. The podetia vary somewhat in length and thick- 
ness, and at times become more or less glabrous. The apothecia are 
typically solitary, and in old plants, as observed by Acharius (Lich. Univ. 
p- 583), become compound and conglomerate. On the basal thallus there 
occur frequent cephalodia, which are tuberculose, brownish, with the 
gonimia glomerulosely arranged. It is intimately allied to P. fibula 
Tuck. (Nyl. ex Cromb. Grevillea, xv. p. 15), a similar American plant 
which (ex Nyl. in zt.) differs in the thicker spores (0,018-0,025 mm. 
long, 0,007-0,008 mm. thick). 
Hab. On moist shady rocks in upland and subalpine situations.— 
Distr, Local and scarce in the mountainous tracts of N. England, N. 
Wales, 8.W. Scotland, the 8.W. Highlands, among the Grampians, and 
in W. Ireland.—B. M.: Cader Idris and Dolgelly, A vonethahinee Tees- 
dale and Eglestone, Durham; Borrowdale, Cumberland. New Gallo- 
way, Kirkeudbrightshire; Achrosagan Hill, Appin, Argyleshire; Ben 
Lawers, Perthshire; Ben Nevis, Inverness-shire; hills of Applecross, 
Ross-shire. Dunkerron, co. Kerry; Kylemore and Salrock Road, Conne- 
mara, co. Galway. 
2. P. strumaticus Nyl. ev Cromb. Journ. Bot. 1875, p. 140 
(nomen).—Thallus determinate or .subeffuse at the base, verrucoso- 
granulate, greyish-white ; podetia short, stoutish, verrucoso-granu- 
late (K+yellowish). Apothecia moderate or submoderate, sub- 
globose, beneath as if strumosely appendiculate, paraphyses mode- 
rate; spores oblongo-ellipsoid, 0,018-0,024 mm. long, 0,006-0,009 
mm. thick. 
Differs from the preceding in the thallus being firmer, not pulverescent, 
and especially in the peculiar form of the apothecia, resulting from the 
turgescent perithecium. The podetia are simple, somewhat crowded, 
occasionally very short, so that the apothecia appear subsessile. The 
cephalodia are similar to those of P. cereolus. 
Hab. On shady ledges of schistose rocks in subalpine districts.—Distr. 
Local and scarce in N. Wales, among the Grampians, and in the N.W. 
Highlands, Scotland.—B. M.: Cader Idris, Merioneth. Glen Lyon, Perth- 
shire; Morrone, Braemar, Aberdvenshire. 
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