544 NORTH AMERICAN FLORA [Volume 7 
ILLustRrations: Holway, N. Am. Ured. 1: pl. 27, f. 98a—c, pl. 28, f. 98d—g. 
Exsiccatt: Barth. Fungi Columb. 2467, 3370, 3768; Barth. N. Am. Ured. 367, 568, 967, 
1172, 1174, 1270, 1470, 1775, 2469, 2633; Brenckle, Fungi Dak. 66; Carleton, Ured. Am. 2; Clem- 
ao rele te ee ey 1182; Ellis & Ev. N. Am. Fungi 3478; 
atrett, Fungi Utah. ; ;_D. Griff. W. Am. Fungi 24; S . & Earle, Econ. Fungi 1. 
B16; Sydow, Ured. 775, 1276, 2078, 2277. . iii eee eee 
50. Micropuccinia Sidalceae (Holway) Arthur & Jackson. 
Puccinia Sidalceae Holway, N. Am. Ured. 1:67. 1907. 
O. Pycnia unknown. 
Ill. Telia hypophyllous and petiolicolous, round, 0.5-1 mm. across, or elongate to 2 
em. when petiolicolous, scattered, or more or less circinate in small groups, firm, pulvinate, 
tardily naked, at first cinnamon-brown, becoming blackish, ruptured epidermis persistent 
and conspicuous; teliospores ellipsoid or oblong, variable in size, 23-32 by 38~48 yu, rounded 
above and below, not constricted at septum; wall cinnamon- or chestnut-brown, 3-5 » thick, 
becoming gradually thicker toward apex up to 84, smooth; pedicel fragile, slender, twice 
to thrice length of spore, usually broken away, colorless. 
On MaLvacEAE: 
Sidalcea glaucescens Greene, California. 
Sidalcea malvaeflora (Moc. & Sessé) A. Gray, California. 
Sidalcea oregana (Nutt.) A. Gray, California, Oregon. 
Sidalcea spicata Greene, California, Oregon. 
TYPE LocaLity: Klamath County, Oregon, on Sidalcea oregana. 
DISTRIBUTION: Southern Oregon to central California. 
ILLUSTRATION: Holway, N. Am. Ured. 1: pl. 29, f. 100. 
Exsiccati: Barth. N. Am. Ured. 2470; Sydow, Ured. 1782. 
51. Micropuccinia heterospora (Berk. & Curt.) Arth. & Jackson; 
Arth. Bull. Torrey Club 48: 41. 1921. 
Puccinia heterospora Berk. & Curt. Jour: Linn. Soc. 10: 356. 1868. 
Uromyces pulcherrimus Berk. & Curt. Grevillea 3:56. 1874. 
Uromyces Thwaitesii Berk. & Br. Jour. Linn. Soc. 14:92. 1875. 
Uromyces Sidae Thiim. Rev. Myc. 1:10. 1879. 
Uromyces pictus Thiim. Rev. Myc. 1:10. 1879. 
Uromyces Malvacearum Speg. Anal. Soc. Ci. Argent. 12:72. 1881. 
‘Puccinia Thwaitesit Wint. Hedwigia 22: 130. 1883. 
Uromyces malvicola Speg. Anal. Soc. Ci. Argent. 17:94. 1884. 
Puccinia heterospora pulcherrima Lagerh. Tromsé Mus. Aarsh. 17:61. 1895. 
Caecomurus Malvacearum Kuntze, Rev. Gen. 33: 450. 1898. 
Caeomurus malvicola Kuntze, Rev. Gen. 33: 450. 1898. 
Caecomurus pictus Kuntze, Rev. Gen. 33: 450. 1898. 
Caeomurus Sidae Kuntze, Rev. Gen. 33: 450. 1898. 
Dicaeoma pulcherrimum Kuntze, Rev. Gen. 33: 467. 1898. 
Dicaeoma Thwaitesii Kuntze, Rev. Gen. 33: 470. 1898. 
Uromyces Pavoniae Arth. Bull. Torrey Club 31:1. 1904. 
Telospora Pavoniae Arth. Résult. Sci. Congr. Bot. Vienne 346. 1906. 
Dasyspora heterospora Arth. Résult. Sci. Congr. Bot. Vienne 346. 1906. 
O. Pycnia unknown, probably not formed. 
III. Telia chiefly hypophyllous, small, 0.2-0.5 mm. across, scattered, or more commonly 
gregarious, and occasionally confluent in more or less circular groups of few to many sori 
on yellowish spots reaching 1.5 cm. in diameter, early naked, firm, pulvinate, blackish-brown, 
central sori occasionally cinereous from germination, ruptured epidermis yot conspictious; 
teliospores with septum few, or entirely wanting in some collections, ellipsoid or globoid, 
16-28 by 18-36 yw, rounded above and below, not constricted at septum, which is often ob- 
lique; wall chestnut-brown, 2-2.5 » thick, thickened at apex or opposite pedicel 5—7 », smooth; 
pedicel colorless, firm, once to twice length of spore, often attached laterally, frequently 
at septum; mesospores numerous, usually predominating, often to exclusion of two-celled 
teliospores, globoid or obovoid, 16-24 by 18-32 u, rounded above, rounded or narrowed below, 
the wall 1.5-3 » thick, thickened above, 5-7u, chestnut-brown, smooth, the pedicel colorless, 
firm, two to five times length of spore. 
This species is correlated with Nigredo Epicampis (Dietel & Holway) Arth. and Dicaeoma 
hibisciatum (Schw.) Arth., the telial characters of the three species bearing a very remarkable 
similarity, and the hosts of the short-cycled form corresponding with the aecial hosts of the 
Dicaeoma, those of the Ni redo not being positively known. This agreement doubtless indi- 
cates a common origin for the three species. 
