J. A. MARTINDALE : NOTES ON BRITISH LICHENS. 



36T 



Apothecia often very numerous and crowded at the centre, 

 which they then completely hide, concave at first, after- 

 wards plane ; disc deeper coloured than the thallus or con- 

 colorous, surrounded by an entire margin. Paraphyses of 

 irregular thickness, articulate, upper cells gradually widening, 

 apical cell oblong or spherical, •oo5--oo8 mm. in diameter. 

 Spores ellipsoid or oblongo-ellipsoid, 'ooq-'oii mm. long 

 and •0035--0045 (•005) mm. broad (Nyl). 

 Sperniogonia minute, slightly prominent, reddish. Spermatia 

 borne on arthrosterigmata, straight, ■oo2 5--oo3 mm. long 

 and •ooo5-*ooo7 mm. broad. 



On stones of all sorts, limestone, sandstone, slate. 



Distribution unknown, probably very common. I have 

 gathered it in all parts of Westmorland. 



This species is little understood, and is often confounded 

 with nmroruni^ and sometimes called miniata^ at others 

 pitsilla. Both pusilla and iiiiniata of authors embrace a 

 large number of heterogeneous things. The plants growing 

 on hard rocks and in open and dry situations are often 

 intensely miniate and naked ; those, on the other hand, 

 growing on limestone and in moist situations are most 

 frequently vitelline and albo-suffused. The margins of the 

 apothecia vary according to the varying thallus, being thick 

 and mealy in the suffused states, and thin and shining in 

 the naked. 



8. *Lecanora obiiterascens Nyl. in Flora, 1883, p. 99. 



Thallus closely adnate, minutely areolate, here and there 

 minutely lobato-squamulose, resembling that of Lecanora 

 lobtilata^ orange yellow or subminiate. 



Apothecia with a deeper coloured disc and thin margin, plane, 

 eventually somewhat convex. Paraphyses stoutish, articu- 

 late, sparingly branched, uppermost cell (or two upper) 

 swollen, subspherical, -004- -007 mm. diam. Spores ellipsoid, 

 •oo8--oii mm. long, •oo4--oo5 mm. broad. 



Spermatia . . . . ? 



On rocks of all kinds, limestone, granite, serpen- 

 tine, sandstone. Rocks, Craig Tulloch, Blair Athole 

 (Crombie). 



I have only seen one small specimen, which is without 

 spermogones, gathered in the Haute Vienne by Mons. 

 Lamy de la Chapelle. The thallus in this specimen is almost 

 covered with the apothecia. 



Dec. 1887. 



