Puccinia evadens Hark.

On Baccharis emoryi, Zion National Park near Springdale. Oct 29, and in 2 localities at La Verkin, Washington Co. Nov 1. Causing fusiform swellings and witches broom on stems, the systemic, caulicolous habit of the uredinial stage being unusual. When in this county again on Apr 14 old brooms and fusiform swellings were observed occurring abundantly at one locality east of Rockdale and at Zion Lodge in Zion Natl Park, the latter about a mile from the place where the rust was collected earlier. New to the Utah Flora.

Coleosporium baccharidis Cooke and Harkness

On living twigs of Baccharis

Puccinia evadens

On living leaves of Baccharis pilularis. San Francisco. November.

This Puccinia has been overlooked heretofore on account of its minute size and pale color. It is without doubt the final stage of Coleosporium baccharidis, being always found together with it on the same plant — Coleosporiurn upon the branches, and Puccinia upon the leaves.

Puccinia evadens
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This fungus induces large, elliptical, swollen stem galls and witches brooms on coyote brush and desert broom. The brooms are composed of compact clusters of small branches up to 20 cm long that often conceal the stem swelling beneath.

[Hosts: Baccharis pilularis, sarothroides, emoryi, thesioides

Range: CA, AZ]

Eriosporangium evadens (Harkn) pt 3 1913

Coleosporium baccharidis
Puccinia evadens
Caeoma negerianum

0. Pycnia amphigenous and caulicolous, scattered among the aecia on the leaves and younger branches, inconspicuous, honey-yellow, globoid or ovate, 150-175 um in diameter.

1. Aecia amphigenous, or more commonly caulicolous, causing fusiform or irregular swellings of the branches, sometimes forming witches' brooms, scattered, oblong or oblong- linear, 0.5-1 mm. wide by 1-4 mm. long, early dehiscent, at first orange-colored, drying to a dirty-white, pulverulent, ruptured epidermis or cortex overarching, when the spores fall away showing pits or fissures; aeciospores irregularly oblong, or oblong-fusiform, 22-26 by 35-60 um, often narrowed and acute at both ends, but especially above; wall pale- yellow or quite colorless, moderately thick, 2-3 um, somewhat thicker above, 3-9 um , noticeably but finely verrucose, with thickly set and irregular warts.

II. Uredinia chiefly hypophyllous, scattered, usually few, round or oblong, 0.1-0.3 mm. long, soon naked, orange-colored, becoming pale, somewhat pulverulent, ruptured epidermis often overarching, otherwise inconspicuous; urediniospores broadly ellipsoid, obovate-ellipsoid, or nearly globoid, 23-27 by 27-35 um; wall thin, 1.5-2 um nearly colorless, finely and rather sparsely verrucose-echinulate, with points about 3 um apart, the pores small, very indistinct, apparently more than 4 and scattered.

III, Telia chiefly hypophyllous, and to some extent on the young branches, scattered, round, 0.3-1 mm. across, soon naked, pulvinate, pale cinnamon-brown, or cinereous by germination, ruptured epidermis inconspicuous ; teliospores oblong or obovate-oblong, 27-32 by 48-63 m, rounded at both ends, or somewhat narrowed below, somewhat constricted at the septum; wall pale-brownish, or almost colorless, smooth, thin, 1.5-2 um, usually thicker at the apex, 3-6 um; pedicel colorless, or slightly tinted, terete, 6-10 um in diameter, thin-walled, once to twice length of spore.

On Carduaceae :
Baccharis consanguinea Greene, California.
Baccharis emoryi A. Gray, Arizona.
Baccharis pilularis DC, California.
Baccharis pteronioides DC, Michoacan.
Baccharis sp., Cuba.

Type locality: San Francisco, California, on Baccharis pilularis.

Distribution : Central California and Arizona southeastward through Mexico, and the West Indies; also in South America.

Dicaeoma evadens (Hark) Arthur & Jackson pt 6 1921

Coleosporium baccharidis
Puccinia evadens
Caeoma negerianum
Eriosporangium evadens

0. Pycnia amphigenous and caulicolous, scattered among the aecia on leaves and younger branches, inconspicuous, honey-yellow, globoid or ovoid, 150-175 um in diameter.

1. Aecia amphigenous, or more commonly caulicolous, causing fusiform or irregular swell- ings of the branches, sometimes forming witches' brooms, scattered, oblong or oblong-linear, 0.5-1 mm. wide by 1-4 mm. long, early dehiscent, at first orange-colored, drying to a dirty- white, pulverulent, ruptured epidermis or cortex overarching, when the spores fall away showing pits or fissures; aeciospores irregularly oblong or oblong-fusiform, 22-26 by 35-60 um, often narrowed and acute at both ends, but especially above; wall pale-yellow or quite colorless, moderately thick, 2-3 um., somewhat thicker above, 3-9 um., noticeably but finely verrucose, with thickly set and irregular warts.

II. Uredinia chiefly hypophyllous, scattered, usually few, round or oblong, 0.1-0.3 mm. long, soon naked, orange-colored, becoming pale, somewhat pulverulent, ruptured epidermis often overarching, otherwise inconspicuous; urediniospores broadly ellipsoid, obovoid-ellipsoid, or nearly globoid, 23-27 by 27-35 um; wall thin, 1.5-2 um, nearly colorless, finely and rather Sparsely verrucose-echinulate with points about 3 um apart, the pores small, very indistinct, apparently more than 4 and scattered.

III. Telia chiefly hypophyllous, and to some extent on the young branches, scattered, round, 0.3-1 mm. across, soon naked, pulvinate, pale cinnamon-brown, or cinereous by germination, ruptured epidermis inconspicuous; teliospores oblong or obovoid-oblong, 27-32 by 48-63 um, rounded at both ends, or somewhat narrowed below, somewhat constricted at septum; wall pale-brownish, or almost colorless, smooth, thin, 1.5-2 um, usually thicker at apex, 3-6 um; pedicel colorless, or slightly tinted, terete, 6-10 um in diameter, thin-walled, once to twice length of spore.

On Carduaceae: Baccharis consanguinea Greene, California. Baccharis Emoryi A. Gray, Arizona. Baccharis halimifolia, North Carolina; Cuba. Baccharis pilularis DC, California. Baccharis pteronioides DC, Michoacan. Baccharis salicina T. & G., New Mexico. Baccharis sarothroides A. Gray, Arizona. Baccharis thesioides H. B. K., Arizona.

Type locality: San Francisco, California, on Baccharis pilularis.

Distribution: Central California to New Mexico, and southeastward through Mexico and the West Indies: also in South America.

Puccinia evadens Harkness

Eriosporangium evadens

On Carduaceae: Baccharis sp., Santa Clara (Prov. Santa Clara), March 22, 1903, II, III, Holway.

The species is autoecious, pycnia, aecia, uredinia, and telia all being known, and is found in southern California and Arizona to Central Mexico. The collection here listed is the only one known from the West Indies.