Fairman : Ascomycetes from New Mexico 255 



Phoma herbarum Solidaginis Sacc. 

 On old stems of Solidago Pitchcri Nutt. (14743). 



Phoma oleracea Sacc. 

 On old stems of Heliopsis scabra Dunal (14648). 



Phoma Rudbeckiae Fairman 

 On old stems of Rudbeckia laciniata L. Immature. 



Phoma Sidalceae sp. nov. 



Pycnidia scattered on whitened areas or gregarious on oblong 

 hlack spots, globose or oblong, immersed then erumpent, black, 

 175-200 X 140 p.; spores numerous, oblong or elliptic, rounded at 

 the ends, simple, 2-3-nucleolate, hyaline, 4-7 X 3-4 f*, with in- 

 conspicuous basidia. 



On old stems of Sidalcea ncomexicana Gray (14251). 



Phoma thalictrina Sacc. & Malbr. 



On old stems of Thalictrum Fendleri Engelm. (14652) and on 

 Thalictrum dasycarpum F. & L. (14658). 



Macrophoma cornina (Peck) Sacc. 

 On dead branches of Cornus instolonea A. Nels. (14780 p.p.). 



Dothiorella phomopsis sp. nov. 



Pycnidia immersed in a basal stroma and aggregated in groups 

 of 1-5, often at the bottom of Stictis-like depressions, or occur- 

 ring singly and without evident stroma, when occurring singly 

 arranged in a subseriate manner between the longitudinal ribs of 

 the stem and becoming erumpent-superficial, globose-depressed, 

 of loose cellular structure, centrally ostiolate, contents white upon 

 section, externally brown or black, 1 50-300 /x in diam. ; spores 

 borne on stout basidia, numerous, oblong-ellipsoid, rounded at the 

 ends, hyaline, eguttulate, 4-8 X 3-4/*. 



On old stems of Viorna Scottii (Porter) Rydb. (14627). 

 This is an ancipital fungus, alternating between Phoma and 

 Dothiorella. 



