PHOPHORUS.] PILOPHOREI. 115 



white ; pocletia short, erect, simple, verrucoso-grranulate or sul)- 

 pxilverulent (K-|- yellowish). Apothecia small, sul)f!:lobose, para- 

 physcs thiekish ; spores eUipsoideo-fusiform, U,01(j-0,U22 mm. loug, 

 0,t»0J:-0,005 mm. thick. — Cromb. Grevillca, xv. p. 15. — Stereocaulon 

 c^reohis Ach. Meth. p. 316 ; Borr. iu Engl. Bot., Suppl. t. 1J067. 

 S. cereolinum Sm. Eug. El. v. p. 233 pro parte ; Tayl. in Mack. Fl, 

 Hib. ii. p. 83. Lichen (Isidium) cereolus Ach. Prodr. (1798) p. 89. 

 SU'reocauJon conde^isatum var. cereolinum Ach. pro parte, Cromb. 

 lach. Brit. p. 17 pro parte. To this also belongs P. fibula (non 

 Tuck.) Leight. Ann. IMag. Nat. Hist. 18G9, vol. iv. p. 201 ; Lich. El. 

 p. 76, ed. 3, p. 69 pro parte. — Brit. Exs. : Leight. n. 383 ; Larbal. 

 Lich, Hb. n. 5. 



When steiile, thi.^ closely resembles Stereocaulon pileatum, from which, 

 when fertile, it is easily distinguished by the simple spores. The basal 

 thallus is uoi'mally grauuloso-ditFract, sometimes becoming more or less 

 pulveraceo-dehtescent. 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. o83), become compound and conglomerate. On the basal thallus there 

 occur frequent cephalodia, which are tuberculose, brownish, \s-ith the 

 gonimia glomerulosely arranged. It is intimately allied to P. fibula 

 Tuck. (Xyl. ed' Cromb. 'jrevillea, xv. p. lo). a similar Ameiican plant 

 which {ex Nvl. in litf.) differs in the thicker spores (0,018-0,0Jd mm. 

 long, 0,007-0,008 mm. thick). 



Hub. On moist shady rocks in upland and subalpine situations. — 

 Disfr. Local and scarce in the mountainous ti-acts of N. England, X. 

 Wales, S.W. Scotland, the S.W. Highlands, among the Grampians, and 

 in W. Ireland. — B. M. : Cader Idris and Do! gelly, Merionethshire; Tees- 

 dale and Eirlestone, DLirham ; Borrowdale, Cumberland. Xew Gallo- 

 way, Kirkcudbrightshire ; Achrosagan Hill, Appin, Argyleshire : Ben 

 Lawers, Perthshire ; Ben Xevis, Inverness-shire ; hiUs of Applecross, 

 R jss-shire. Dunkerron, co. Kerj-y ; Kylemore and Sah-ock Eoad, Comie- 

 mara, co. Galway. 



2. P. strumaticns T^yl. ex Cromb. Joum. Bot. 1575. p. l-ti) 

 (uomen). — Thallus determinate or subefFuse at the base, verrucoso- 

 granulate, greyish-whita : podetia short, stoutish, verrucoso-granu- 

 late (K -I- yellowish). Apothecia moderate or submoderate, sub- 

 globose, beneath as if strumosely appendiculate, paraphyses mode- 

 rate ; spores oblongo-ellipsoid, 0^0l8-0,(:»2-4 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, 

 ocCiisionally very short, so that the apothecia appear subsessile. The 

 cephalodia are similar to those of P. cereolus. 



Hub. On shady ledges of schistose rocks in subalpine districts. — Disfr. 

 Local and scarce ia N. Wales, among the Grampians, and in the X.W. 

 IIis:hlands, Scotland. — B. M. : Cader Idris, Merioneth. Gleu Lyon, Perth- 

 shire ; Morrone, Braemar, Aberdeenshire. 



i2 



