. The British rust fungi (Uredinales) their biology and classification. Rust fungi. Fig. 215. P. Arrhenathevi. a, teleutospores on Arrheiiatherum, from Hampton- in-Arden ; 6, another, and c, two abnormal ones, from Lichfield; d, a. paraphysis and uredospore from the latter. Teleutospores. Sori hypophyllous, scattered, minute, puncti- forin 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/a) and darker, hardly or not at all constricted, gen- erally attenuated dow
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. Fig. 215. P. Arrhenathevi. a, teleutospores on Arrheiiatherum, from Hampton- in-Arden ; 6, another, and c, two abnormal ones, from Lichfield; d, a. paraphysis and uredospore from the latter. Teleutospores. Sori hypophyllous, scattered, minute, puncti- forin 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/a) and darker, hardly or not at all constricted, gen- erally attenuated downwards, smooth, pale-brown, 30—45 X18—24/A, mixed with brown- ish paraphyses; pedicels short, brownish. [^cidia on leaves and flowers of Berheris vulgaris;] uredo- and teleutospores on Arrhenatherum elatius. (Figs. 215, 216.) This .species produces on the Berheris its characteristic witches'-brooms, composed of many upright branches ; it was at first mistakenly identified with JE. Magelhaenicum Berk. The secidium has not been seen in Britain,.. Fig. 216. P. Arrhenathei-i. Teleuto- spores, paraphysis and uredospore,. on Arrhenatlierum, Silesia (ex herb. Sydow).. 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, W. B. (William Bywater), 1848-1938. Cambridge, University Press
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