Puccinia baccharidis D & H

On Baccharis viminea. Pasadena, Cal., Aug., 1893, leg. McClatchie (No. 359). — This fungus has most resemblance to another Californian species on Baccharis pilularis, viz.: Puccinia evadens, Hark. In the " Provisional Host-Index of the Fungi of the United States" of Farlow and Seymour Puccinia evadens is also noted as occurring on Baccharis viminea. But there can be no doubt as regards the specific difference of the forms.

Dicaeoma baccharidis (Dietel & Holway)

Puccinia baccharidis
Caeoma punctato-striatum
Eriosporangium punctato-striatum

0. Pycnia amphigenous, numerous, crowded in small orbicular groups, comparatively large, punctiform, globoid-flask-shaped, 125-175 um in diameter; pycniospores globoid, 2-3 um in diameter.

1. Aecia hypophyllous and caulicolous, when on leaves in orbicular groups surrounding the pycnia, at first bullate, irregular in form, 0.3-1 mm. in longest diameter, soon dehiscent, orange-colored, fading to pale-fuscous when dry, ruptured epidermis overarching, on stems form- mg long fissures, 5-15 mm., without producing hypertrophy, pulverulent, distinctly fuscous when dry, old fissures more or less closed; peridium wanting; aeciospores fusiform or globoid, mostly ovoid-ellipsoid, rounded below, usually somewhat pointed above or even acute, variable in size, 20-29 by 27-60 um, usually 22-25 by 30-45 m; wall slightly tinted or colorless, moderately thick, 2-2.5 um, slightly if at all thicker above, verrucose with rather thickly set punctate beads, arranged in more or less evident longitudinal lines, especially toward apex .

II. Uredinia amphigenous, scattered, abundant, roundish, 0.1-0.7 mm. across, at first bullate, soon naked, pulverulent, cinnamon-brown, ruptured epidermis usually overarching; urediniospores broadly ellipsoid or obovoid, 20-27 by 29-45 um; wall thin, 1.5-2.5 um, pale cinnamon-brown, finely and closely echinulate, with points 1 /x or less apart, the pores evident, usually large, scattered, about 6.

III. Telia chiefly hypophyllous, thickly scattered, round, 0.3-0.8 mm. across, soon naked, pulvinate, pale cinnamon-brown, or cinerous by germination, ruptured epidermis inconspicuous; teliospores oblong, 24-29 by 45-70 um, rounded or obtuse at both ends, some- what constricted at septum; wall pale cinnamon-brown, smooth, thin, about 1.5 m. s. little thicker above, 2-6 um; pedicel colorless, usually inflated up to 25 ju in diameter near the spore, tapering downward, once to twice length of spore, the wall thin, collapsing upon germination of the spore.

On Carduaceae:
Baccharis coerulescens A. Gray, Hidalgo.
Bacckaris Emoryi A. Gray, California.
Baccharis glutinosa Pars., Arizona, New Mexico, Texas; Chihuahua, Michoacan, Oaxaca; Guatemala.
Baccharis viminea DC, California.
Baccharis sp., Jalisco, Mexico (state).

Type locality: Pasadena, California, on Baccharis viminea.

Distribution: From central California to Texas, and southward through Mexico and Central America; also in South America.