PHACIDIUM. 59 



slender, 1*5-2 fx thick, apex slightly olavate or irregularly 

 thickened, up to 3-5 /x thick, brownish, agglutinated 

 together. 



Stictia phacidioides, Fries, Syst. Myc., ii. p. 198. 



Trochila phaddioides, Karst., Disp. Syst. Myc, p. 2-49. 



Phacidium acroataphyli, Karst, Symb. Myc, p. 25(3 ; Phil., 

 Brit. Disc, p. 391 ; Sacc, Syll., n. 2909. 



On dry lea vis of Acrostaphijlos uca-ursi. 



Specimens examined from Fries, Scler., Suec, n. 277, and 

 Karst., Fung. Fenn., n. 843. 



Phacidinm minutissimum. Auersw., in Rab., Fung. 

 Eur., n. 228; Phil., Brit. Disc, p. 389; Sacc, Syll., viii. 

 n. 2915. 



Gregarious on whitish spots, or often densely gregarious 

 over the entire under surface of the leaf, at first closed and 

 brown, innate, irregularly circular, finally the yellowish- 

 white disc is exposed by the rupture of the epidermis into 

 3-4 teeth, up to \ mm. across ; asci elliptic-clavate, 8-spored ; 

 spores irregularly 2-seriate, oblong-fusoid, continuous, 

 hyaline, smooth, 7-8 x 3-4 jjl ; paraphyses slender, apex 

 rather abruptly capitate and up to 5 /x across, colourless. 



Naevia minutissima, Rehin, Krypt. -Flora, Disc, p. 138. 



On the under side of dry, fallen oak leaves. 



Specimen in Rab.. Fung. Eur., n. 228, examined. 



Ascospore, very minute, gregarious or sometimes crowded ; 

 often covering the entire under surface of the leaf. Accord- 

 ing to Rehm, the apex of the ascus becomes violet wdth 

 iodine. 



Phacidium seriatum. Mass. 



Densely gregarious, often arranged in series, circular or 

 broadly elliptical, plane or slightly concave, the epidermis 

 being eventually torn and exposing the disc, ^— \ mm. across ; 

 asci cylindric-clavate, apex narrowed, 8-spored ; spores irre- 

 gularly 2-seriate, cylindric-oblong, ends obtuse, straight, 

 hyaline, smooth, for some time continuous and 2-guttulate, 

 finally becoming 1-septate, 7-9 X 3 /x, ; paraphyses hyaline, 

 slender, slightly incrassated at the base, apex not at all 

 thickened. 



Stictis seriata, Lib., Crypt. Ard., Fasc. iii. (1834), n. 233 



