Didymosphjeria ettryasca, n. s. On dead leaves of Plnus Mur- 
rayana. Summit of Mt. Helena, Lewis and Clarke -County, Mont. 
September, 1887. F. W. Anderson, No. 403. Peritliecia scattered, sub- 
erumpent, minute 80-100//, perforated above. Asci inequilaterally 
ovate, sessile, 35-40 by 12-15//. Parapliyses? Sporidia bi-triseriate 
ovate oblong, 1-septate, constricted, rounded at the ends, brown, 12-15 
by 3^-5//. The peritliecia are only partially erumpent, remaining partly 
covered by the epidermis. 
Puccinia mutabilis, n. s. II and III. On Allium mutahile , Sand 
Coulee, Mont., June, 1888. Anderson, No. 44G. Sori suborbicular or 
elliptical, small, J n,m in diameter, covered at first by the epidermis, 
soon exposed and chestnut-brown, sometimes more or less confluent. 
Uredospores, pale, faintly aculeolate, globose or elliptical 18-22 by 15//. 
Teleutospores, ovate or elliptical obtuse and rounded, and moderately 
thickened above, distinctly constricted, narrowed below (in the ovate 
form) into the rather stout hyaline pedicel, which is a little shorter than 
or about as long as the spore. This differs from P. alliorum , Cda., P. 
porri , (Sow.) Winter, and P. scillcc , Linhart, in its shorter, obtuse spores. 
Sporidesmium macrosporoides, n. s. On stems of Artemisia tri- 
dentata. Glendale, Mont., October, 1888. F. W. Anderson, No. 391. 
Forming orbicular or subelongated disks l-3 mm in diameter, at first 
covered by the white tomentose coating of the stem, then bare and black, 
appearing as a slightly elevated disk or flattened tubercle, the lower 
stratum of which is composed of the closely compacted hyplne changed 
into a subgrumous mass and giving rise to a superficial layer of conidia 
which are at first oval or subglobose and subhyaline, but soon become 
dark and 1-septate or oftener sarcinuliform, i. <?., subglobose 8-12// in 
diameter, and divided into 4 cells by two septa at right angles to each 
other. These 4-celled conidia soon increase in size by the formation of 
additional cells till they finally simulate more or less perfectly the form 
of the conidia of Macrosporium , clavate or obovate with 3-4 transverse 
septa and one or more longitudinal septa forming an olive brown con- 
idium 30-40 by 18-20//, without any distinct pedicel. Var. gummosum , 
on twigs of Betula alnifolia (Anderson, 294), is preceded by a gummy 
exudation in the form of a small transparent globule and has the 
conidia more irregular in shape. 
Septosporium heterosporum, n. s. On living leaves of Vitis 
Calif or nica* near Orange, Cal. Prof. F. L. Scribner, October, 1887. 
Spots scattered and more or less confluent, indefinitely limited, rusty 
brown above, J to 1 centimeter in diameter, smoky black below or ap¬ 
pearing gray on account of the tomentum of the leaf. 
Hyplim hypophyllous, issuing in fascicles from the stomata of the leaf 
and bearing at their apices the ver} T variable conidia, which are at first 
oblong-cylmdrical, 2-3 septate, 20-40 by 5-7//, like the conidia of a Cer- 
cospora. These conidia soon become constricted at the septa and each 
of the three or four cells become uniseptate. The three primary septa 
