292 PROCEEDINGS OF THE AMERICAN ACADEMY. 



with material received from Professor Bainier by Dr. Thaxter, and 

 the two forms have been grown on many and varied kinds of nutrient 

 material for nearly three years during which time, as already men- 

 tioned, the American material has never been observed to produce 

 small spherical bulbils; nor has the form received from Bainier 

 developed the large sclerotium-like bodies which he describes, al- 

 though every effort has been made to obtain them. 



There is also a marked difference in the method of growth in these 

 two forms. The mycelium of the American form grows very slowly 

 on bran or corn agar, but fairly rapidly on horse dung, while Bainier's 

 species grows rapidly on a variety of media. There is also a marked 

 difference in the general appearance of the two while growing in 

 cultures; the mycelium of the former being quite inconspicuous at 

 first and often two or three weeks elapse before bulbils are produced. 

 The two forms thus appear to be very probably distinct and there 

 seems little doubt but that Bainier was mistaken in referring his 

 species to /-*. aspergilliformis. Neither of these forms has associated 

 with it Acremoniella-like Chlamydospores, such as Eidam describes 

 and it seems not improbable that Bainier is right in believing that 

 these spores do not belong to P. aspergilliformis, but are those of 

 " Acrcmonium atruni" which although frequently associated with it 

 are not a part of its life cycle. 



The writer has under cultivation about a dozen pure cultures of 

 Acremoniella atra obtained from different sources, some of which were 

 closely associated with bulbils, and these have been grown for nearly 

 three years under varying conditions of temperature, moisture, and 

 nutrient material, the different mycelia having been contrasted on 

 plate-cultures under various conditions. In no instance, however, 

 have bulbils or Aspergillus-Iike conidiophores been produced. 



Harz ('71) has described a form under the name of Monosporium 

 acremonioides that produces chlamydospores and conidiophores 

 similar to those of P. aspergilliformis Eidam, but not associated with 

 bulbils, and states that the conidia were produced on secondary 

 heads either sessile or short-stalked, like those of Melanospora ccr- 

 vicula. This latter character has been used by Costantin ('88) as the 

 basis of a new genus, Harzia, into which he puts the foregoing species 

 under the name of Harzia acremonioides. Later, in referring to 

 Papulospora aspergilliformis Harz ('90) calls attention to the striking 

 reseml)lance between the two spore-forms of this fungus and those of 

 Monosporium acremonioides Harz, and suggests that, if they are the 

 same, the name should at least be Papulospora acremonioides, although 



