120 NORTH AMERICAN FLORA (VoLUME 7 
Pucciniastrum Ledi Karst. Bidr. Fin). Nat. Folk 31: 57. 1879. 
Coleosporium Ledi Schrot. Beitr. Biol. PA. 3: 55. 1879. 
feridermium abietinum Thim. Mitth. Forstl. Vers. Oest. 2: 320. 1880. 
Melampsoropsis Ledi Arth. Result. Sci. Congr. Bot. Vienne 338. 1906. 
QO. Pycnia amphigenous, numerous, irregularly scattered, orange-yellow, becoming 
chestnut-brown, punctiform, conspicuous, flask-shaped, erumpent, 100-1304 across. 
I. Aecia hypophyllous, on discolored spots occupying a part or all of a leaf, some- 
what in rows, oblong, flattened at sides, bullate, about 0.5 mm. broad, 1 mm. long, some- 
times confluent and longer, dehiscent at apex; peridium colorless, margin erect, finely 
lacerate, cells abutted (not overlapping), outer wall and portions in contact very strongly 
thickened, moderately verrucose, appearing transversely striate in section, inner wall 
smooth and thin, not easily seen when dry; aeciospores broadly ellipsoid, 15-23 by 20-34 u ; 
wall colorless, thick, 2.5-3.5 #, coarsely tuberculate with deciduous tubercles excepta 
narrow longitudinal stripe ; contents orange-yellow fading to colorless. 
ON PINACEAE : 
Picea excelsa (Lam.) Link, Europe ; not yet found in America. 
II. Uredinia hypophyllous, scattered or grouped, flat, small, pustular, afterward coal- 
escing into irregular groups, yellowish-red; peridium delicate; urediniospores broadly 
elliptical or almost globoid, 14-22 by 20-30; wall colorless, medium thick, 1.5-2.5 4, ver- 
rucose with closely set, deciduous tubercles ; contents orange-red, fading to colorless. 
III. Telia hypophyllous, scattered or grouped, on discolored spots, small, 0.1-0.2 mm. 
across, flat, at first blood-red ; teliospores oblong or cuboid, 10-15 by 13-20 4, in a series 
70-90 » long, separating easily; wall colorless, thin, 1 4 or less, smooth; contents orange- 
red, fading to colorless; sporidia ovate, 7 by 11 #. 
ON ERICACEAE : 
Ledum glandulosum Nutt., Wyoming. 
Ledum groentandicum Oeder (L. latifolium Ait.), New Hampshire, Wisconsin. 
TYPE LOCALITY : Upper Lusatia, Germany, on Abies Picea (Picea excelsa). 
DISTRIBUTION : New Hampshire to Wyoming ; also in Europe. 
ILLUSTRATION : Bot, Zeit. 37: pl. 10, f. 7, 8. 
ExsiccaTi: Ellis & Ev. N. Am. Fungi 37057; Ellis & Ev. Fungi Columb. 354. 
6. Melampsoropsis Arctostaphyli (Dietel) Arth. Résult. Sci. Congr. Bot. 
Vienne 338. 1906. 
Chrysomyxa Arctostaphyli Dietel, Bot. Gaz. 19: 303. 1894. 
O, Iand Il. Pycnia, aecia and uredinia unknown. 
III. Telia hypophyllous large, 0.3-0.8 mm. across, crowded in small groups on red- 
dish-brown spots, soon naked, flat, roundish or polygonal, waxy, subepidermal, ruptured 
epidermis conspicuous ; teliospores oblong, 13-17 by 23-504, in a series 100-170 long 
wall colorless, smooth, thin, 1-1.5; contents orange-red. 
ON ERICACEAE : 
Arctostaphylos Uva-Ursi (1,.) Spreng., Wisconsin. 
TYPE LOCALITY: [Three Lakes], Wisconsin, on Arctostaphylos Uva-Ursi. 
DISTRIBUTION: Known only from the type locality and vicinity. 
7. Melampsoropsis Piperiana Arthur, sp. nov. 
O and I. Pycnia and aecia unknown. 
Il. Uredinia hypophyllous, small, angular, few in a group or solitary, waxy, becoming 
somewhat pulverulent; peridium wanting; urediniospores catenulate, oblong to lanceo- 
late, 16-26 by 40-65 #, narrowed toward each end and pointed or obtuse; wall colorless, 
coarsely and closely verrucose, medium thick, 1.5-2 #. 
III. Telia unknown. 
ON ERICACEAE : 
Rhododendron caltfornicum Hook., Oregon, Washington. 
Type collected at Seattle, Washington, May, 1892, C. V. Piper. 
DISTRIBUTION : Northwestern United States 
