360 



BRITISH DISCOMYCETES. 



(Margin entire ; sporidia vermiform 

 Margin pale ; sporidia clavate or fusiform, medium 



S1ZG •• •• • • •• •• •* ** 



, . Margin flexuous ; sporidia minute, elliptic. 



' Margin thin, compressed ; sporidia large, 3-septate 



Margin thin, compressed ; sporidia large, simple . . 



Margin serrated ; sporidia smaller, simple .. 



^Margin absent 



Sporidia brown 

 2. 1 Sporidia hyaline ; cups seated on a spot-like crust 



Sporidia hyaline ; cups emerging through the bark 



Margin tumid ; sporidia brown 



Margin crenulate ; sporidia hyaline, fusiform, large 



Margin incurved ; sporidia hyaline, slender, small 



Margin entire ; sporidia hyaline, elliptic, minute 



Margin entire; sporidia hyaline, oblong- fusiform, 

 very large 



Margin obtuse ; sporidia hyaline, clavate, large . . 



Margin vinous-purple ; sporidia hyaline, fusnorm 



.Margin absent 



On dead stems of Hypericum : sporidia 3-septate . . 



On dead oak : sporidia 4 to 5-septate 



vermifera. 



macrospora. 

 flexella. 

 compressa. 

 connivens. 

 rubro-tiiujena 

 2 



Bloxami. 

 Lecideola. 

 subtectum. 

 lignyota. t 

 maura. 

 litoralis. 

 minutissima. 



Loncierse. 



clavispora. 



atro-vinosa. 



4 



Hyperiei. 



proximo,. 



A. SPORIDIA ELLIPTIC. 



(a) Coloured, septate. 



1. Patellar ia lignyota. Fries. 



Scattered or subgregarious, sessile, when dry horny, 

 when moist softer, applanate, concave, then plane, grow- 

 ing black ; margin tumid, subcrenulate ; hymenium when 

 moist fuliginous ; asci clavate, obtuse ; sporidia 8, oblong- 

 ovoid, brown, 1-septate, 10 x 4/ij paraphyses filiform, 

 adherent. 



Patellaria lignyota — Fries, "Sys. Myco," ii. p. 150; 

 B. and Br., " Ann. Nat. Hist.," No. 579 ; Cooke, " Handbk," 

 No. 2177. Arthonia melaspermella — Nyl. in " Flora," 

 1855 ; Leighton, "Lichen Flora," ed. iii. p. 416. 



Exs.— Rabh, " Myco. Eur.," 1152; Phil., "Elv. Brit," 

 No. 146. 



On decorticated wood. 



Cups about J of a line broad. No visible thallus, and 

 much resembling a Lecidea. Opinion will differ as to 

 the alliance of this species, but for the present I prefer 

 to retain it as a fungus. 



