262 PROCEEDINGS OF THE AMERICAN ACADEMY. 



conspicuous food material. The cells below the spiral send out 

 branches which divide and may, in turn, produce others. These 

 grow up around the spiral and completely envelop it, thus forming 

 a somewhat spherical mass of cells. In a moist atmosphere these 

 are said to develop into sclerotium-like bodies. By transferring 

 these large bulbils to pieces of moist bread, Bainier succeeded in 

 inducing them to develop into perithecia which he refers to the genus 

 Ceratostoma, although it is not evident why this form should not also 

 be referred t« Melanospora. This subject will be further dealt with 

 below under Papulospora aspergilliformis. 



In connection with pyrenomycetous forms it will be well to con- 

 sider briefly two additional species which may be regarded as doubt- 

 fully pyrenomycetous. 



FORMS DOUBTFULLY REFERRED TO PYRENOMYCETES. 



Paqnilospora Candida Sacc, parasitic on Geoglossum, has been re- 

 ported by Dr. Thaxter to be connected with hypocreaceous perithecia 

 found on specimens of the host obtained in vSouth Carolina; but this 

 material was, unfortunately, not available for examination, and 

 since pure cultures of this fungus grown on different media have thus 

 far failed to produce any perfect form, its position must, for the present 

 at least, remain more or less uncertain. The fact, however, that the 

 bulbil is definitely connected with a Verticillium would seem to afford 

 strong evidence of its hypocreaceous nature. A second doubtful 

 form is Acrospeira mirahUis (Beck & Br.), with which Biffen ('02) 

 has associated a species of "Sphaeria," but since he was unable to 

 obtain the bull)ils or "chlamydospores" as he terms them, of Acro- 

 speira from pure cultures of the ascospores, his conclusions must be 

 accepted with some reserve. 



Papulospora Candida Sacc. 



Plate 4, Figures 1-47. 



This fungus was first found by Ellis who collected it in New. Jersey 

 and distributed it by N. A. F. No. 3673. The species appears to be 

 common and distributed from N. Carolina to Maine. The material 

 for the present investigation was found growing abundantly as a 

 parasite on CiroqJossum (/Inhrum in a maple Sphagninn swamp near 

 Walnut Hill, Mass. It was first described (Mich. II, p. 576) as 

 Papulospora Candida, by Saccardo who also mentions that Verti- 



