360 BOTANICAL GAZETTE [October 



accom 



dissemination is probably for the most 

 Lrrents. It is hardly necessary to men- 

 ds of dissemination occur, and may be 



associated, in other genera of the Mucorales, like Mucor and 

 Mortierella. 



In this connection it may be mentioned that since the publication 

 of the writer's note on Choanephora (Rhodora 5:97) the common 

 C. cucurbitarum has been cultivated in the Harvard Laboratories 

 from Cuba, Porto Rico, Venezuela, and other localities, and that 

 the culture, formerly mentioned as having been brought by the 

 writer from La Plata, Argentina, which seemed to correspond to this 

 species, has been contrasted with the plus and minus strains sepa- 

 rated by Blakeslee from New England material of this species. 

 As a result, the Argentine form produced abundant conjugations, 

 forming perfect zygospores, which left no doubt as to its identity. 

 The normal sporangia were also obtained by subjecting these forms 

 to special conditions of moisture and nutrition, and were found to 

 agree in all essentials with the figures and description given by 

 Moller of his C. americana. Since, therefore, the ranges of the 

 two overlap, and there seem to be no essential differences between 

 them, the synonymy suggested in the Rhodora note may be regarded 

 as finally established. 



In addition to C. cucurbitarum, the writer has had in cultivation 

 for some years two other American species. One of these was first 

 obtained on Hibiscus flowers in the park at Palermo near Buenos 

 Aires, and appears to correspond to C. infundibulifera, the secondary 

 heads of which, unlike those of C. cucurbitarum, are persistent and 

 become cupula te after the spores, which are smooth, have been 

 shed. This species is very common on Hibiscus flowers in the 

 West Indies, and is everywhere abundant in Grenada and Trinidad 

 during the rainy season, where it was often seen by the writer fruit- 

 ing abundantly on flowers which were still attached to the host 

 plant, or even on buds that had apparently been hindered from 

 opening by its growth. It has also been cultivated on material 

 received from British Honduras and from Guatemala. 



A third species, unlike either of the two just mentioned, was 

 also found on flowers of Cucurbitaceae near Buenos Aires and was 



