Comprehensive Description
provided by North American Flora
Nigredo valens (Kern) Arthur
Uromyces valens Kern, Rhodora 12 : 125. 1910.
O and I. Pycnia and aecia unknown.
Uredinia chiefiy hypophyllous, scattered, oval or oblong, 0.3-0.4 mm. wide by 0.5-1 mm. long, tardily naked, somewhat pulverulent, cinnamon-brown, ruptured epidermis conspicuous; urediniospores ellipsoid, 16-19 by 19-26/x ; wall cinnamon-brown, 1.5-2/i thick, evenly and strongly echinulate, the pores 4, equatorial.
- bibliographic citation
- Joseph Charles Arthur, Frank Dunn Kern. 1912. (UREDINALES); AECIDIACEAE (continuatio), GYMNOSPORANGIUM. North American flora. vol 7(3). New York Botanical Garden, New York, NY
