118 NORTH AMERICAN FLORA [VorumE 7 
Uredinia erumpent, pulverulent. Peridium very delicate, evanescent, sometimes want- 
ing. Urediniospores catenulate, globoid to lanceolate; wall colorless, verrucose with some- 
what deciduous tubercles, pores obscure. 
Telia erumpent, definite, roundish, waxy becoming velvety. Teliospores catenulate, 
one-celled, oblong or cuboid; wall colorless, thin, smooth. 
Tybe species, Chrysomyxa Ledi (Alb. & Schw.) DeBary (on Ledum palustre). 
Telial host belonging to family Empetraceae. 1. M. Empetri. 
Telial host belonging to family Pyrolaceae. 2. M. Pyrolae. 
Telial host belonging to family Ericaceae. 
Uredinia and telia epiphyllous. 3. M. ledicola. 
Uredinia and telia hypophyllous. 
Urediniospores ellipsoid. 
Telia inconspicuous, spores small, 4. M. Cassandrae. 
Telia noticeable, spores medium. 5. M. abietina. 
Telia large, spores large. 6. M. Agcetostaphyli. 
Urediniospores lanceolate. 7. M. Piperiana. 
Telial host belonging to family Vacciniaceae. 8. WM. Chiogenis. 
1. Melampsoropsis Empetri (Pers.) Arth. Résult. Sci. Congr. Bot. 
Vienne 338. 1906. 
Uredo Empetri Pers.; DC. Fl. Fr. 6: 87. 1815, 
Cacoma Empetri Link, in Willd. Sp. Pl. 62: 16. 1825. 
Erysibe Empeiri Wallr. Fl. Crypt. Germ. 2: 199. 1833. 
Thecopsora Empetri Karst. Bidr, Finl. Nat. Folk 31: 143. 1879. 
Chrysomyxa Empetri Schrét. Krypt. Fl. Schles. 31: 372. 1887. 
O and I. Pycnia and aecia unknown. 
II. Uredinia hypophyllous, round or oblong, at first covered by the bladdery epidermis, 
finally naked and pulverulent, orange-red, ruptured epidermis conspicuous; peridium 
delicate or wanting; urediniospores elliptical or ovoid, 18-26 by 26-37; wall colorless, 
medium thick, 2-3, verrucose, with short, deciduous, slightly separated tubercles, pores 
obscure ; contents orange-colored when fresh. 
Ill. Telia unknown. 
On EMPETRACEAR : : 
Empetrum nigrum ., New Hampshire, New York; Quebec. 
TYPE LOCALITY: Vosges, France, on Empetrum nigrum. 
DISTRIBUTION : New England and New York northward; also in Europe. 
2. Melampsoropsis Pyrolae (DC.) Arth. Résult. Sci. Congr. Bot. 
Vienne 338. 1906. 
Aecidium (?) Pirolae DC. Fl. Fr. 6: 99. 1815. . 
Caecoma (Aecidium) pyrolatum Schw. Trans, Am. Phil. Soc. Il. 4: 294. 1832. 
Uredo pirolatum Korn, Hedwigia 16: 28. 1877. 
Chrysomyxa pirolatum Wint, in Rab. Krypt. Fl. 11: 250. 1881. 
Chrysomyxa Pirolae Rostr. Bot. Centr. 3: 126. 1881. 
O. and I. Pycnia and aecia unknown. 
II. Uredinia hypophyllous, small, 1 mm. in diameter, round, evenly distributed, yel- 
lowish-red, pulverulent, ruptured epidermis evident; peridium delicate, walls smooth, 
colorless, thin, 1#; urediniospores elliptical or obovate, often angular, 16-23 by 20-304; 
wall colorless, medium thick, 1.5-2#, prominently verrucose with somewhat deciduous 
warts ; contents orange-red. 
III. Telia hypophyllous, evenly and closely scattered, small, round, 0.2-0.4 mm. across, 
flat, waxy, at first yellowish-red, afterward blood-red ; teliospores irregularly ellipsoid, 7-9 
by 12-194, in a series 100-1304 long; wall colorless, smooth, thin, 1; basidiospores 
7-8 » in diameter. 
ON PYROLACEAE : : 
Moneses uniflora (1,.) A. Gray (UM. grandifiora S. F. Gray), Colorado, Maine, Wyoming; 
Alaska ; Quebec. ; 
Pyrola asartfolia Michx., Colorado, Pennsylvania. 
Pyrola chlorantha Sw., Colorado, New York, Wyoming. 
Pyrola elliptica Nutt., lowa, Maine, Minnesota, New Hampshire, New York, Ohio, Penn- 
sylvania. 
Pyrola grandiflora Radius, Greenland. 
Pyrola minor I,., Greenland. 
