niYsciA.] rnTsciEi. 301 



to be refrarded a.^ distinct, on acrount of its manner of frrowth, itsbeinfr 

 niucli 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. 



Hah. On rocks, walls, old pales, and the trunks of trees in maritime 

 and upland districts. — Di^tr. Rather local and not common in Gr.at 

 ]?ritain ; a))parently rare in X. Ireland. — H. M. : Hay Tor, Dartmoor, 

 Devonshire; near Penzance and St. Austell, Cornwall ; AVind.sor Park, 

 Derkshire: Wheatfield Park, Oxfordshire; Colwall. Herefordshire; 

 Malvern, Worcestershire ; near Shrewsbury, Shropshire : Aberdovov, 

 Meriunethshire. Lawers, Killin, Perthshire; Findhaven Hill, Forfjii- 

 shire; Durris, Kincardineshire ; Lairg, Sutherlaudshire. Co. Antrim. 



Form perfusa Xj'l. ex Lamy Bull. Sec. Bot. t. xxv. (1878) p. 382. 

 — Thallus smaller, widely expanded, densely stipate. Apothecia 

 moderate. 



As stated by 31. Lamy, /. c, this has the appearance of a frranular 

 crust, though composed of minute, very crowded, thalline laciuia^. Our 

 British specimens are well fertile. 



Hah. On gi-anitic walls of gardens and houses in maritime and upland 

 situations. — Di><tr. Local, in X.E. Scotland and amonir theX. Grampians. 

 — B. M. : Portlethen, Kincardineshire ; Crathie, Braemar, Aberdeen- 

 shire. 



Yar. ft. pygmaea Xyl. Lich. Scand. (1861) p. 108.— Thallus 

 small, determiuate ; lacinice 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 pygmcpa 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 laciuife. 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. 



Hah. On exposed granitic walls in an upland district. — Distr. Extremely 

 local and scarce, among the S. Grampians, Scotland. — B. >I. : Ben Lawers, 

 Perthshire. 



B. CIXEEASCEXTES.— ThaUus greyish or whitish, rarely brown. 

 Apothecia brownish or blackish ; spores 1-septate, brown or 

 dark-brown : spermogoues black, with spcrmatia cylindrical or 

 slightly thickened at either apex, rarely acicular. — Eiijjlttjscia 

 Cromb. Grcvillea, xv. (1887) p. 78. 



a. Spermogoues with cylindrical or subcyUndrical spermatia. 



6. P. intricata Schser. Enum. (1850) p. 11. — ThaUus expanded, 

 csespitose, suberect, roundly compressed, laciniate, densely puberulo- 

 villose, greyish-glaucous or greyish-brown ; beneath greyish-white, 

 subcanaliculate ; lacinia) divaricately branched, ven- much en- 

 tangled (K~ , CaCl~). Apothecia lateral, sessUe, moderate, plane or 



