Proceedings of the Canadian institute. 8q 



New Species of Canadian Fungi. By J, B. Ellis and J. Dearness. 



(Read April 24, 1897.) 



HYMENOMYCETES. 

 Porta subrufa, E. & D. 



Resupinate, effused, mostly in small patches 2 — 4 cm across, inseparable, soft, 

 juicy, creamy-white when fresh, becoming reddish when dry; margin thin, membran- 

 aceous, narrow, almost wanting. Pores round to sub-angular, .1 — h cm. long, ^—^ 

 mm. wide, dissepiments thin, margin acute but not lacerate. Spores elliptic-oblong 

 4X3/"- 



On a rotten beech log at Granton, Ont. Nov. 1896. No. 2442 in Herbarium of 

 J. Dearness. 



Apparently allied to Porta cntentatu, Mont., but the pores cannot be called 

 " very short," and their surface is uneven. 



PYRENOMYCETES. 

 Rosellinia compressa, E. & D. 



Perithecia scattered or often in small groups of 4 — 6 or more, sometimes 2 or 3 

 sub-confluent, superficial, rather depressed, globose, about ^mm. in diam., membran- 

 aceous, sparingly clothed with short (20 — 30 //) spine-like, black hairs; ostiolum 

 minute, papilliform. Asci cylindrical, 75 x 10 — ii/^, obscurely paraphysate. Sporidia 

 uniseriate, elliptical, obtuse, brown, strongly compressed, 12 — 16 x 8 — 10 // and 

 about 3 /u thick, 



On decorticated elm, Granton, Ont., Canada. Herb. D., No. 1791. 



DlDYMOSPH^RIA ThALICTRI, E. & D. 



Perithecia gregarious, depressed-globose, 200 to 250 /i in diam., visible through 

 the darkened epidermis which is barely pierced by the papilliform deciduous ostiolum. 

 Asci oblong, short stipitate, paraphysate, 8 spored. Sporidia biseriate, at first 

 fusoid-oblong, sub-hyaline, 4-nucleate, but finally uniseptate and slightly constricted, 

 sub-inequilateral or slightly curved, pale brown, 13 — 15 x 3^ //. 



On dead stems of Thalictrnm polygamitm, London, Can., Aug. 1895. Herb. D., 

 No. 2297. 



DISCOMYCETES. 



Pseudohelotium Canadense, E. & i). 



Ascomata scattered, short-stipitate, whitish, with a yellowish tinge, about 

 I mm. in diam., puberulent ; margin fringed with tufts of short, pale hairs, and 

 when dry the opposite sides rolled together so as to become elliptical or triangular 

 in outline; texture, fibrous; apparently sessile, but short-stiped. Disk concave, 

 yellowish. Asci, clavate-cylindrical, paraphysate, about 40 x 4 //. Sporidia biseriate, 

 oblong, .obtuse, mostly straight, hyaline, 8 — 12 x i^ — 2 //. 



On dead stems of Arctium Lappa L., London, Can., Aug., 1895. Herb. D., 

 No. 2340 



