637 



Stroma pulvinate, more or less convex, but not effused. (Cli- 



toxylon). 



* Stroma externally colored, not black. 



H. xanthocreas, B. & C. Grev. IV, p. 51. 



Hypoxylon Peckianum, Sacc. Syll. I, p. 360. 



" At first distinct, pulvinate, then by confluence forming a mass 

 half an inch broad, black, papillate from the projection of the minute 

 perithecia. Asci linear. Sporidia uniseriate, elliptical, .0003 of an 

 inch long." (10x5//, Cke.). 



On alder, New York (Peck), New England (Sprague). 



Peck, in 31st Rep. p. 49, says: "Our specimens (on prostrate, 

 dead alders) agree with those received from Dr. Curtis under this 

 name, but they do not agree with the description of the species as 

 published in Grevillea. In our specimens the young plant is covered 

 with a compact, yellow, conidiiferous stratum bearing elliptical conidia 

 4-5 fi long. As the stroma increases in size, it becomes naked above 

 and of a purple-brown or chestnut color, which contrasts beautifully 

 with the yellow margin. When old, it becomes darker, but we have 

 not seen it black, as described. The surface is generally irregular or 

 uneven. The stroma is whitish or pallid within, but near the surface 

 it is yellow. The sporidia vary from 10-15 // long." 



The specimens of this species in Rav. Car. V, No. 57, have the 

 stroma 3-4 mm. broad, brown above with the margin and inside 

 yellow. Asci (p. sp.) about 60 x 6 /i, with a slender, stipitate base of 

 about the same length. Sporidia uniseriate, elliptical, pale brown. 

 7-9 x 4-5 ft. There does not seem to be much doubt that the speci- 

 mens found by Peck in New York are the genuine II. xanthocreas. 



H. epiphloeum, B. & C. Grev. IY, p. 52. 



The early conidial .stage consists of small (1-2 mm.), thin patches 

 of brick-red tomentum consisting of erect hyphae subopposirdy 

 branched above and minutely roughened, bearing ovate, hyaline, 

 3-3| x 2J fi conidia. In the midst of these conidial patches soon 

 appear small clusters of 3-12 perithecia |-1 mm. diam., and either 

 scattered singly, or more or less connate, the different groups or 

 clusters more or less confluent but not continuous, covered at first with 

 the brick-red, conidial layer, then bare and black. Asci cylindrical. 

 80 x 4| //, (spore-bearing part about 60 p. long). Sporidia uniseriate, 

 navicular, deep brown, 7-8x3 p.. The perithecia have a distinct 

 papilliform ostiolum. 



On Magnolia glauca, Carolina (Ravenel), New Jersey (Ellis). 



