35 
GO-75 /* long and 4-4J /* thick at the sub-bulbous base, subhyaline and 
subacute above, dark brown below, continuous (or faintly septate *?). 
Conidia subfalcate-fusoid, hyaline, 2-4 nucleate, 14-20 by 2^-3/*, ends 
subacute, basidia short. 
NEW SPECIES OF LOUISIANA FUNGI. 
By J. B. Ellis and A. B. Langlois. 
Oidium obductum, n. s. On living leaves of young Quercus ( fal- 
cata 6 !). St. Martinsville, La., May, 1889. Langlois, 1708. Hypophyl- 
lous. Sterile hyphae, slender (3-4/* thick), sparingly septate, branched, 
loosely interwoven and with the large (35-50 by 18-22/*) barrel-shaped 
conidia forming a thin continuous or partially interrupted cinereous 
white layer over the greater part or often over the entire surface of the 
leaf. The concatenate conidia are formed by the constriction of the 
fertile hyphae, rather abruptly contracted at each end and truncate. 
Ovularia maclur^e, u. s. On living leaves of Madura aurantiaca. 
St. Martinsville. Hypophyllous on rusty brown round spots, 3-5 milli¬ 
meters in diameter. Prostrate hyphae branching, erect (fertile); hyphae 
simple or sparingly branched above, slender, 15-22 by 2^-3/*, contin¬ 
uous, hyaline. Conidia subcatenulate, oval, hyaline, continuous, 6-9 by 
2J-3 /*. 
Dactylaria mucronulata, 7i. s. On decorticated and decaying 
wood of Carya. St. Martinsville, La., May, 1888. Langlois, No. 1220. 
Prostrate sterile hyphae obsolete or wanting, fertile hyphae erect, 35-40 
by 3J /*, continuous or with 1-2 faint septa and brown below, more or 
less angularly bent, and subhyaline above with terminal and lateral mu- 
cron ulate teeth bearing the oblong 2-nucleate, hyaline, 8-10 by 2J-3 /*, 
conidia. The fertile hyphae appear like a dull-purplish, velvet-like pu¬ 
bescence on the surface of the wood. JD. purpurella, Sacc., has larger 
conidia and subspathulate-pointed hyphae. 
Coniosporium mycophilum, 7i. s. Parasitic on pileus of Polyporus 
pergamenus , (Fr.) and Lentinus ursinus , (Fr.). Louisiana, May, 1888. 
Langlois, 1306. Forms thin olive-black spots, scattered or confluent 
about 1 millimeter diameter. Conidia elliptical, olive-black, smooth, 
about 8 by 4/*. 
Hormodendrum divaricatum, n. s. On rotten wood. St. Martin’s 
County, La., May, 1888. Langlois, No. 1292. Forming loose, scat¬ 
tered tufts, fertile hyphae, soon opaque, erect or spreading, 80-150 by 
4-5/*; divaricately branched, the few branches often issuing at right 
angles, and like the upper portion of the main hyphae articulated and 
constricted, separating into subelliptical, or lemon-shaped, opaque con¬ 
idia, 7-12 by 6-7/*, the lower ones being the longer, the upper and ter¬ 
minal ones often subglobose. 
