242 



Mycologia 



the name Eurotiopsis had already been used for an entirely differ- 

 ent fungus, Saccardo substituted the generic name Allescheria, 

 The fungus described here differs from Costantin's species in pro- 

 ducing coremia, in having larger perithecia, asci, ascospores and 

 conidia and the latter noncatenulate. We regard it as an unde- 

 scribed species and have named it Allescheria boydii in honor of 

 Dr. Boyd, the discoverer. 



Its characters are as follows : 



Allescheria boydii sp. nov. 



I. Perithecia numerous, crowded, covering the surface of the 

 medium, usually erumpent or subsuperficial, globose, thin, mem- 

 branous, dark-brown astomate, 100-200 //, in diam.; asci globose or 

 subglobose, thin walled, evanescent at maturity, 10-20 fx in diam.; 

 paraphyses none ; ascospores 8, globose to subglobose or somewhat 

 ovoid, continuous, smooth, pale yellowish-brown when mature, 

 globose form about 7 /a in diam., other mostly 5.5-7 x 4-4.5 



II. Pycnidia unknown or wanting. 



I'll*. Byssoid conidial form, Cephalosporium boydii, thin, floc- 

 cose, white at first, soon gray, margin radiate-fimbriate, later 

 changing to pale greenish-ochraceous as sporulation begins, fertile 

 hyphae much branched, spreading, conidiophores lateral or terminal 

 mostly short ; conidia adhering in small or large subglobose masses, 

 continuous, subglobose to oblong elliptical, very variable in size 

 and shape, hyaline at first becoming pale, yellowish-brown when 

 old, smooth, 8-15 x 4-7.5//,, mostly 10-12 x 5-6^. 



IIP. Coremia (Dendrostilbella boydii) with dark brown syn- 

 nema very variable in height and thickness, 200-300 p or more 

 high, head subglobose ; sporophores alternately branching, ultimate 

 branches once or twice the length of the conidia ; conidia practically 

 same size, shape and color as in the byssoid condition and adhering 

 in a globular mass after abstriction. 



Isolated from a lesion in a human ankle, by Dr. Mark F. Boyd, 

 Galveston, Tex., 1921. Type: Slides no. 32921a, Cephalosporium 

 form; 32921&, Dendrostilbella form; 32921c, Perithecia. 



For greater convenience in referring to the various spore stages 

 of the pleomorphic ascomycetes, we have adopted the Roman 

 numerals used by uredinologists with some modifications to meet 

 the different conditions. I indicates an ascogenous fructification, 

 as a perithecium or apothecium; II indicates a pycnidial fructifica- 



