34 
Mycologia 
two species are the same, the description of the one being drawn 
from fresh or young plants and the description of the other from 
old and dry plants. 
If the arbitrary distinction between Phyllosticta and Macro- 
phoma, the difference in the length of spores, is to be maintained, 
this plant should be referred to the genus Macrophoma. 
The following is a description of my specimens : 
The discolored spots are from 1-5 millimeters in diameter, 
white or brownish-white, irregularly scattered over the leaves. 
The pycnidia are subepidermal, globose-lenticular, generally epi- 
phyllous but sometimes hypophyllous, brown to black, with dis- 
tinct, circular ostiole. The spores are cylindric, straight or a 
little curved, obtuse at the ends, guttulate, apparently septate in 
old specimens, 4.5-5. 5 X 20-30 fx. 
Streptothrix pereffusa sp. nov. 
Effused, dense, confluent, olive-green to black; mycelium 
septate, colored, 'branching; sporophores erect, septate, diffusely 
branched, branches flexuous ; spores borne at the ends and the 
sides of the branches, colored, ovoid to ellipsoid 1 , 5^8 /t. 
On bark, Bemus Point, N. Y., July, 1913. 
This species is closely related to Y. atra B. & C. It may be 
separated from the latter by the color, the smooth sporophores, 
and the dense growth. 
The following species have been reported from America : S. 
abietina Pk., S. glauca E. & E., 5 ". cinerca Morg., S. fusca Corda, 
S. atra B. & C. 
It is unfortunate that the name Streptothrix is used for a genus 
in the Chlamydobaeteriaceae. Cohn established this genus in 
1854, but Corda had already used the name for a genus in the 
Dematiaceae in 1839. 
Oidium album sp. nov. 1 
Effused, forming a thin floccose layer over the substratum, 
white changing to dirty-white in drying; mycelium branched, 
septate ;. sporophores erect or suberect, simple or branched ; spores 
concatenate, hyaline, ovoid to ellipsoid, 12— 14 X 16-22 fi. 
On bark and Coriolus abietinus, Bemus Point, N. Y., July, 
I 9 T 3 - 
1 See Mycologia 5: 47. 1913. 
