SHEAR: Mycotocicat NoTEs AND NEW SPECIES 457 
The spores are however quite different from those figured by Des- 
mazieres. The leaf figured by him appears to be that of Camellia 
rather than Magnolia, but the spores may possibly have been 
figured from the specimen on Magnolia to which he refers in his 
description. . 
No. 553 Rav. Fun. Amer. on persimmon (Diospyros) and 526 
E. & E.N. A. F. on Camellia Japonica were distributed under this 
name but the material in the Department herbarium is old and 
poor, showing no spores. 
Whichever may prove to be the type of Desmazierés’ species, 
we believe the plant we have is sufficiently characteristic to deserve 
recognition as a variety at least. The fungus appears abundantly 
on apparently healthy leaves after they have been dampened and 
kept in a moist chamber for a week or ten days. 
Plectrothrix gen. nov. 
Sterile hyphae creeping, scanty ; fertile, erect scattered with 
more or less irregularly arranged spinose branches near the apex ; 
conidia globose, hyaline, borne singly on the tips of the branches. 
This appears most nearly related to the genus Monosporium 
Bon., as treated by Saccardo, but differs in the much simpler fer- 
tile hyphae with the peculiar spur-like branches, to which the name 
refers. The type of the genus is 
Plectrothrix globosa sp. nov. 
Evenly effused or slightly tufted ; sterile hyphae, scanty, hya- 
line or’ subhyaline or subhyaline, septate ; fertile hyphae, erect, 
evenly scattered over the matrix or sometimes in small groups, 
3-5-septate, hyaline or slightly colored toward the base, 250-350 
X 3-4 #4, apex acute with 3-9 short, conical or spur-like branches, 
Which are usually not longer than the diameter of the spores ; the 
lower sometimes prolonged and dichotomous at the tip ; conidia 
globose, hyaline, 15-20 » diam., contents homogeneous. 
On leaves of Vaccinum macrocarpon kept in a moist chamber 
in the laboratory, Dept. of Agriculture, Washington, D.C. Type 
material no. 1108, C. L. S. in Myc. Herb. U. S. Dept. Agricul- 
ture. This fungus followed regularly the appearance and matu- 
tity of Pestalozzia guepini vaccinit on cranberry leaves kept in a 
moist chamber from one to two weeks. 
BurEAv oF PLANT Inpustry, U.S. DEPT. 
AGRICULTURE, WASHINGTON, D. C. 
