. The British rust fungi (Uredinales), their biology and classification. Uredineae. Fig. 215. P. Arrhi'uatheri. a, teleutospores on Arrhenatherum, from Hampton- in-Arden ; h, another, and c, two abnormal ones, from Lichfield ; d, a paraphysis and uredospore from the latter. Teleutospores. Sori hypophyllous, scattered, minute, puneti- form or shortly linear, covered by the epidermis, black; spores ellipsoid - oblong or oblong- clavate, rounded, truncate or rarely gently attenuated a- bove where they are thickened (5—10//) and darker, hardly or not at all constricted, gen- erally attenuated down
. The British rust fungi (Uredinales), their biology and classification. Uredineae. Fig. 215. P. Arrhi'uatheri. a, teleutospores on Arrhenatherum, from Hampton- in-Arden ; h, another, and c, two abnormal ones, from Lichfield ; d, a paraphysis and uredospore from the latter. Teleutospores. Sori hypophyllous, scattered, minute, puneti- form or shortly linear, covered by the epidermis, black; spores ellipsoid - oblong or oblong- clavate, rounded, truncate or rarely gently attenuated a- bove where they are thickened (5—10//) and darker, hardly or not at all constricted, gen- erally attenuated downwards, smooth, pale-brown, 30—45 X 18—24//, mixed with brown- ish paraphyses; pedicels short, Fig. 216. P. Arrhenatherl. Teleuto- spores, paraphysis and uredospore, on Arrlienatlierum, Silesia (ex herb. Sydow). [/Ecidia on leaves and flowers of Berheris vulgaris;] uredo- and teleutospores on Arrhenatherum elatius. (Figs. 215, 216.) This species produces on the Berberis its characteristic witches'-brooms, composed of many upright branches ; it was at first mistakenly identified with ^E. Magelkaenicum Berk. The fecidium has not been seen in Britain,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Grove, William Bywater. Cambridge, Univ. Press
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