54 THE WKST \IRC.INI A FLORA 



sublenticular, black, raising the epidermis into pustules, 200 

 fi, diameter. Sporules elliptical, hyaline, 3 x 1.5 jU.. 



Differs from P. Ilicis E. & E. only in its minute sporules. 



PHOMA Fries. 



sp. 



On Opiilastcr opidifoHus, May 7, 1894 (Nuttall, 15 10, 

 494). Spores 7 to 10 x 2.5 to 3 /x. 

 P. NEGUNDiNicoLA RAMicoLA E. & E., Proc. Phila. Acad., 1894, 



357- 



Type habitat: On dead twigs Acer Neguiido, April, 

 1894 (Nuttall, discov. 1483, 465, 466?). 



Perithecia evenly but not thickly scattered, globose, small, 

 .2 to .33 mm. diameter, covered by the slightly ruptured 

 epidermis, but distinctly prominent. Sporules oblong, el- 

 liptical, or ovate hyaline, with a single large nucleus, 10 to 



13 X 4 to 5.5 IX. 



Differs from the typical form, on the dead peduncles, in its 

 broader sporules, the former being but 2.5 to 3 /x. 

 P. Pennsylvanica E. & E., Proc. Phila. Acad., 1894, 357. 



Type habitat: On dead limbs Acer Pennsylvanicum, 

 Feb. 2, 1894 (Nuttall. discov. 1361, 318). 



Perithecia numerous, evenly scattered, subepidermal, .33 

 to .5 mm. diameter, whitish inside, raising the epidermis 

 into minute pustules, but scarcely rupturing it. Sporules 

 subglobose, 6 to 7.5 fx diameter, nearly hyaline. 



P. Asclepiadea E. & E., Field Mus. Bot., 1:107 (1896). 



Type i-iabitat : On dead stems of Aselepias Syriaca, Oct. 

 10, 1894 (Nuttall, discov. 1717, 604). 



Perithecia thickly, but evenly scattered, subelliptical, no 

 to 120 fx in the longer diameter, subcuticular, covered by 

 the blackened epidermis, which is raised into minute pustules 

 but scarcely ruptured. Sporules oblong-elliptical, 2-nucleate, 

 hyaline, 5 to 6 x 2 to 2.5 /x. On curved (almost hooked) 

 basidia 12 to 15 /x long. 



Differs from the next form, which occurs with it on the 

 same stems, in its larger perithecia and sporules and its 

 curved basidia. 

 sp. 



On dead stems Aselepias Syriaea. Oct. 10, 1894 (Nuttall). 



P. MELALEUCA B. & C. 



On petioles Aralia spiiiosa, April 25, 1895 (Nuttall, 1810) 



P. LEUCOSTOMA LcV. 



On Opulaster opulifolius, May 13, 1894. Sporules 2.5 to 

 4 X I (It (Nuttall, 1506, 487). 



