68 
gradually become deeper until the conidi a finally separate into three or 
four separate uniseptate segments of a short elliptical or nearly spheri¬ 
cal shape, about 12/< in diameter, with the epispore distinctly rough¬ 
ened. We have compared this with specimens of Septosporium Fuckelii , 
Thiim., as represented in de Thiimen’s Mycotheca Universalis, 671, and 
with specimens collected in Algeria by Professor Viala. The California 
specimens differ in their much shorter hyphae and very different conidia, 
which are much constricted at the septa. Plate X, Figs. 5 and 6. 
NEW SPECIES OE HYPHOMYCETOTJS FUNGI. 
By .T. B. Ellis and Benjamin M. Everhart. 
Oidium pirinum, n. s, On leaves of Pirns coronaria , Eacine, Wis., 
June, 1888. Dr. J. J. Davis, Xo. 31. Spots large, occupying a large 
part of the leaf, light brown, with definite, rather irregular outline, 
finally spreading over and killing the entire leaf. Conidia subglobose, 
with the surface slightly uneven, hyaline 12-1 Gjj. in diameter, closely 
concatenate in series of 3-4, the lower one supported on a slender basi- 
dium lO-12/i long. A portion of this basidium remains attached to the 
lower conidium as a short pedicel. The prostrate sterile hyphae are 
either wanting or at least not conspicuous, the abundant pulverulent, 
light-cinereous conidia, w hich are mostly on the upper surface of the 
leaf, being the most conspicuous feature. 
Ovularia comp act A, n. s. On living leaves of Macrorhyncus troxi - 
moides. Wet mountain valley, Colorado, July, 1888. Demetrio, 182. 
Spots amphigenous, subelliptical, l cm in diameter, light brown or buff*. 
Hyphae simple, continuous, 15-25 by 4/i, slightly toothed above or entire, 
forming dense tufts and bearing at their tips the ovate 12-15 by 5-G/i 
conidia. 
Langloisula. A new genus of Mucedinece. 
Hyphae prostrate, much branched and interwoven, forming a loose, 
submembranaceous layer, and bearing the large solitary conidia at 
their extremities. Differs from Monosporium in the absence of any 
erect fertile hyphae and from Monilia in its solitary conidia. 
Langloisttla spinosa, n. s. Growing around the base of the culms 
of Andropogon muricatum (in gardens). St. Martinville, La., Jan¬ 
uary, 1889. Langlois, 1641. 
Forms a thin, light-yellow layer like a Corticium , finally becoming of 
a deeper color (tawny-yellow 7 ) and subpulverulent, breaking up into 
frustules like Corticium scutellare I>. & C., and falling off. The fungus 
is made up of prostrate yellow 7 hyphae 2-3 p in diameter, repeatedly 
dichotomously branched, the ultimate branches short, subulate or spm- 
iform, bearing the globose or oval yellow conidia 12-14 p in diameter in 
a loose layer partially covering the subjacent hyphae. The ultimate 
