26 PLANTS BAKERIAN^E. 



walled, scarcely ostiolate, 100-200/A; sporules oval or ovoid, 

 continuous, dark- brown, about 7x5/^; sporophores not seen. 

 On dead leaves and stems of Penstemon, at Hermosa, 30 

 March; n. 20. 



CYTOSPORA BOREELLA, n. sp. Stronea elevating the epi- 

 dermis forming a truncated cone 1mm. in diameter at base 

 and fmm. high; pycuidial cavities few, 2 or three to 5 or 6 

 in each stroma with ostioles united in a minute, emergent, 

 black disc, usually crowned by a scanty reddish-orange 

 gelatinous mass of exuded spores; sporules curved, hyaline, 

 6-8x1 J/A. 



On dead willow twigs at Durango, March 19. Also at 

 Hermosa, 6 April, with Valsa boreella: n. 23. 



This seems to be the spermagonial stage of what has been 

 called Valsa boreella Karst. A similar form on Salix from 

 Kansas (N. A. F. No. 3447) has been called Cytospora nivea, 

 but our specimens are certainly not connected with Valsa 

 idvea. The exuded spore-masses are much the color of those 

 of C. chrysosperma, but they are much less copious and do not 

 tnke the form of a tendril. The spores too are slightly 

 larger than in that species. 



CYTOSPORA CORNI, West. Lamb. Fl. Belg. ii. 372. On 

 dead twigs of Cornus, Durango, Colo., March 20; n. 24. 



This agrees with N. A. F. No. 3448 on Cornus asperifolia 

 from Kansas, which is named as above. The hard car- 

 bonaceous, frequently simple stroma indicates that it belongs 

 in Centhospora rather than in Cytospora. 



PHOMA COLORADOENSIS, n. sp. Pycnidia scattered, rather 

 prominent, but covered by the epidermis and coming away 

 with it, black, lenticular, large, Jmm. or more, of firm cel- 

 lular parenchyma, the cells 8-lOft in diameter, ostiole 

 papillate, at length broadly perforate; sporules cylindric, 



