58 NEW YORK STATE MUSEUM 



Pileus 1.5-2.5 cm broad; stem 6-8 cm long; 2-3 mm thick. 



Among sphagnum. Taylor's swamp, Stow, Massachusetts. 

 August. S. Davis. 



Known by its variously colored pileus and long straight stem. 

 It is a larger species than Leptonia longistriata Pk. 

 to which it is closely related, and has a different habit and habitat 

 and smaller spores. 



Pileus tenuis, campanulatus convexusve, obtusus vel leviter um- 

 bilicatus margine tenue levis striatulatusve, flavo-brunneus vel nigro- 

 brunneus; lamellae tenues, angustae, confertae, adnatae vel leviter 

 sinuatae dente decurrente ; sporis pulverulentae, subincarnatae ; 

 stipes longus, gracilis, rectus, glaber, cavus, aequalis vel sursum 

 leviter attenuatus, basi mycelio albido; sporae angulares, uninu- 

 cleatae, vulgo obhque apiculatae, 10-14x7-9//. 



Macrophoma suspecta 



Perithecia minute, 120-160 ij- broad, gregarious or scattered, oc- 

 cupying large areas on the upper surface of the lower leaves, at 

 first covered by the epidermis, then erumpent, thin, convex, orbi- 

 cular, opening by a pore, black; spores oblong or cylindric, obtuse, 

 hyaline, continuous, 2-4-nucleate, 12-18 ^ long, 4-5 p. broad. 



Dead basal leaves of winter wheat, Triticum vulgare 

 Vill. Lexington, Kentucky. May and June. H. Garman. 



Related to Phoma hennebergii J. Kuehn but differing 

 in its place of growth and in its broader spores and perithecia. It 

 is suspected of killing the host plant, hence the specific name. 

 This is very distinct from Colletotrichum cereale 

 Manns, which is parasitic on wheat, rye, oats, barley and various 

 grasses in Ohio, 



This species is a good illustration of the difficulty sometimes 

 encountered in assigning definite limits to a genus. The genus 

 Alacrophoma was first suggested by Professor Saccardo as one that 

 might be instituted for the reception of species of Phoma hav- 

 ing rather thick perithecia and spores. Berlese and Voglino, act- 

 ing on this suggestion, instituted the genus Macrophoma and in- 

 cluded in it species whose spores should equal 15 !j- or more in 

 length. The spores in the species here described vary in length 

 from 12-18/-/.. It therefore stands on the border line between 

 Phoma and Macrophoma and so far as this character goes might 

 be placed in either genus. Because some of the spores exceed the 

 limiting dimension we have placed the species in Macrophoma, 



