18 PLANTS BAKERI AISLE. 



On dead barkless wood of Cercocarpus, Hermosa, 28 

 March. 



PLATYSTOMUM HYSTERIOIDES, n. sp. Perithecia scattered, 

 elongate, about Ixjmm., rough, dull-black, the base often 

 clothed by clinging wood fibres, ostioles inconspicuous, at 

 length opening by a crack or chink; asci cylindric, short- 

 stipitate, 100-1 40x1 2/z; paraphyses filiform, abundant; 

 ascospores ovoid, 3-septate, constricted at middle septum, 

 ends somewhat unequal, one or both medial cells once ver- 

 tically divided, light-brown, becoming dark-brown and 

 opaque at full maturity, about 20x10^. 



On decorticated Amelanchier, Hermosa, 30 March; n. 75; 

 also on Fendlera, Hermosa, 4 April. 



PLATYSTOMUM SALICUM, n. sp. Perithecia scattered, at 

 first buried then emergent, black, shining, elongate, f-lmin. 

 long by about half as wide, ostioles perforate, usually 

 slightly sunken, longer than wide; asci clavate,, thick- walled, 

 80-100xl6/>t; paraphyses abundant, filiform; ascospores 

 subdistichous, 5- or occasionally 7-septate, slightly con- 

 stricted at middle septum, ends subacute, often curved, one 

 or two cells vertically divided, the divided cells usually 

 somewhat enlarged, light-brown, at length dark and opaque, 

 30-35x7-8 p. 



On dead barkless willow twigs at Hermosa, 30 March. 



SCHIZOSTOMA CERCOCARPI, n. sp. Developing under the 

 bark which falls away, exposing extensive black crust-like 

 areas; perithecia oval, about Jxjmm., black, scarcely 

 shining, densely crowded, often a little confluent, seated on 

 a thin black stromatic crust, ostioles inconspicuous consist- 

 ing of an obscure compressed ridge extending for three- 

 fourths the length of the perithecium; asci linear-cylindric, 

 abundantly paraphysate, about 80x6/*; ascospores mono- 



