296 PROCEEDINGS OF THE AMERICAN ACADEMY. 



directions which shortly forced the individual spores apart. The 

 bulbils were also germinated in Van Tieghem cells, but their germi- 

 nation was much slower and they produced comparatively few germ 

 tubes which seemed to be chiefly from the superficial cells. 



In water cultures the hyphae are usually larger and more densely 

 filled with granular material, with numerous large swollen intercalary 

 or terminal cells (Figures 9b-13, Plate 11). These cells are grouped 

 together irregularly as if attempts were being made to form bulbils 

 but they do not become compact. They often grow very large, as 

 may be seen by a comparison of Figures 9b-13, Plate 11, all of which 

 have the same magnification. 



This development and final fate of the bulbil of P. jMlyspora, 

 suggest a similar condition that is found in x\egerita. In Aegerifa 

 Wehheri Fawcett ('10) the " sporodochia " which measure 60-90 /x in 

 diameter, consist of an "aggregation of conidia-like, inflated, spherical, 

 cells, 12-18 M in diameter," resembling the conditions described for 

 P. polyspora. The development of the latter on the other hand 

 recalls also that of the sporodochium of A. Candida Persoon {Penio- 

 phora Candida Persoon) as described and figured by Lyman ('07) and 

 it is possible that the two structures may be similar in nature. 



OTHER RECORDED BULBIFEROUS FORMS. 



In addition to those above enumerated several other bulbils or 

 bulbiferous forms have been recorded, some of which have already 

 been referred to, but which may here be again mentioned. 



Papulospora Dahliae Costantin ('88). This species was found by 

 Costantin on roots of Dahlia. Its bulbils appear to be somewhat 

 like those of P. coprophila, brownish-red in color, with two or three 

 large central cells surrounded by a layer of empty cortical cells. 

 Conidia belonging to the genus Dactylaria are, however, said to be 

 associated with these bulbils, although it is not evident that the species 

 was cultivated in a pure condition. 



Dendrypihiuvi bulbiferum Zukal ('86) has been mentioned on page 233, 

 and also in connection with P. parasitica. The bulbils described and 

 figured by Zukal are said to be directly associated with the conidia of 

 a Dendryphium; Init here, as in other forms studied by this author, 

 there is no evidence that pure culture methods were used in studying 

 the fungus. 



" Haploirichum roseum Lk." is also stated by the same author ('86) 

 to be associated with bulbils said to be very similar to those of the 



