301 



The species of this genus grow exclusively on Lichens. 

 P. borealis, (Sacc.) 



Epicymatia borealis, Sacc. Syll. 2236. 



Perithecia small, black, 200 jj. diam., adnate or semiimmersecl, at 

 first subglobose, then variously wrinkled and, as it were, split open at 

 the apex. Asci cylindric-clavate, with slender, anastomosely branched 

 (genuine)? paraphyses. Sporidia 4-6, uniseriate, elliptical, constricted 

 in the middle, obtuse at the ends, with two nuclei, 15-17x 7-9 p.. 



On some sterile lichen thallus, Greenland. 



Collected during the English North Polar Exp. 1875-76. 



Of the following genera included by Winter in the Family Sphce- 

 relloidece, no representatives have yet been reported as found in this 

 country, as far as we know. 



TICHOTHECIUM, Flotow. 



In Korber Krypt. Kunde (1848) p. 199. 



Perithecia more or less sunk in the matrix, finally erumpent, small, 

 of tolerably hard, horn-like, carbonaceous substance, black, with a sim- 

 ply perforated ostiolum. Paraphyses united in a slimy mass, obscure 

 or wanting. Sporidia 8 or more in an ascus, 1-3-septate, brown (Win- 

 ter, Die Pilze, II, p. 348.) 



As in the preceding genus, all the species are lichenicolous. 



* 

 MULLERELLA, Hepp. 



In Muller Principes de Classif. de lichens, XVI, Part 2d. 



Perithecia more or less sunk in the matrix, globose, black, perfo- 

 rated above. Asci polysporous. Sporidia continuous, brown. Par- 

 aphyses obscure. Lichenicolous. 



LIZONIA, Ces. & De Not. 



Schema Sferiacei p. 41. 



Perithecia subaggregated, ovoid, glabrous, coriaceo-membrana- 

 ceous, erumpent-superficial, ostiolum minute. Asci clavate. Sporidia 

 biseriate, oblong, often inequilateral, uniseptate, hyaline, becoming- 

 darker, rather large. Paraphyses none. 



Foliicolous fungi, differing from Spliczrdla in their subcoriaceous 

 perithecia crowded-eruinpent, and mostly larger sporidia. 



Placed by Cooke as a subgenus of Sphcerella and by Winter as 

 supplementary to the Fam. Cucurbit ariece. 



