PYHENOPSIS.] PYRENOPSEI. 25 



local and scarce, in N. Wales and S.W. Ireland. B. M. : NearBarmouth, 

 Merionethshire. Near Killamey, co. Kerry. 



4. P. phylliscella Nyl. Flora, 1875, p. 102. ThaUus effuse, 

 squamulose, dark-brown, squamules somewhat subverrucoso-unequal, 

 subadnate, aggregate but not contiguous, rotundato-difform. Apo- 

 thocia endocarpoid, very minute, 5-15 in each thalline squamule ; 

 epithecium punctiform, concolorous, with thin thalline margin ; 

 spores 8nae, oblongo-ellipsoid, 0,005-7 mm. long, 0,003 mm. thick ; 

 paraphyses few ; hymenial gelatine bluish, the theca3 dark-violet with 

 iodine. Cromb. Grevillea, iii. p. 190; Leight. Lich. Fl. ed. 3, p. 14. 



The squamules of the thallus are composed of minute aggregate 

 granules, -which are usually distinct from each other, though here and 

 there becoming contiguous. Its nearest ally is P. tasmanica Nyl., rather 

 than any of our British species, though at first sight it somewhat resembles 

 P. fuscatula. The apothecia are numerous and crowded in the fertile 

 squamules, and the spermogones are not unfrequeut, with spermatia 

 thin, oblong, or fusiforini-oblong. 



Hub, On quartzose boulders in subalpine streams. Distr. Extremely 

 local and scarce, among the Central Grampians, Scotland. B. M. : 

 Beu-y-gloe, Blair Athole, Perthshire. 



5. P. homceopsis Nyl. Flora, 1868, p. 342. Thallus effuse, thin, 

 subgranulose, unequal, subareolate, reddish-brown. Apothecia 

 minute, lecanoroid, concolorous, pale within, the margin connivent, 

 epithecium narrow, colourless ; spores 8nae, 0,011-18 mm. long, 

 0,00710 mm. thick ; paraphyses slender ; hymenial gelatine red 

 or tawny wine-coloured with iodine. Cromb. Journ. Bot. 1869, 

 p. 48 ; Lich. Brit. p. 2 ; Leight. Lich. Fl. p. 15, ed. 3, p. 14. 



This is closely allied to P. grumullfera, Nyl., from which it differs 

 chiefly in the larger spores and gouimia, as also in the thallus being 

 internally paler, especially under the apothecia. In the few specimens 

 gathered, the thallus, except in one instance, was associated with Lecanora 

 frustulosa, and for the most part sterile. 



Hah. On mica-schist rocks in alpine places. Distr. Very local 

 and rare, having been found only on two of the S. Grampians, Scotland. 

 B. M. : Summits of Ben Lawers and Craig Calliach, Perthshire. 



6. P. furfurea Nyl. ex Cromb. Journ. Bot. 1874, p. 332. 

 Thallus effuse, thinnish, granulato-areolate, brownish-black or black, 

 when moist rubricosely blackish or rubricosely reddish. Apothecia 

 minute, at length nearly urceolariform, the margin tumid ; spores 

 8na3, 0,010-12 mm. long, 0,007-8 mm. thick ; hymenial gelatine 

 wine-red with iodine. Leight. Lich. Fl. ed. 3, p. 14. Collema 

 furfureum Nyl. Flora, 1865, p. 353 ; Carroll, Journ. Bot. 1865, 

 p. 286 ; Cromb. Lich. Brit. p. 3 ; Leight. Lich. Fl. p. 17. 



According to Nylander, in Hit., this somewhat anomalous species 

 is perhaps referable rather to the genus Phylliscum, to which it approaches 

 in the structure of the thallus. " This, which superficially is rubricoso- 

 reddish, as in Pyrenopsis, is internally colourless, gelatinose, and excavated 

 with minute, frequent, cellular cavities, among which are scattered 

 somewhat large, oblong, simple, glaucous gonirnia, as in Phylliscum, which 



