. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON GRAMINE^ 285 spores subglobose or ellipsoid, verruculose, yellowish, 19—82 x 16—24 Uredospores. Sori epiphyllous, very rarely hypophyllous, on minute yellow spots, elliptical or oblong, minute, pale rust- coloured ; spores globose to ovate, echinulate, yellowish, 19—30 X 19—26 fji, with numerous germ-pores, and mixed with nume- rous capitate paraphyses which are 10—14^ broad and as much as 80 fA, Fig. 215. P. Arrhenathevi. a, teleutospores on Arrheiiatherum, from Hampton- in-Arden ; 6, another, an
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON GRAMINE^ 285 spores subglobose or ellipsoid, verruculose, yellowish, 19—82 x 16—24 Uredospores. Sori epiphyllous, very rarely hypophyllous, on minute yellow spots, elliptical or oblong, minute, pale rust- coloured ; spores globose to ovate, echinulate, yellowish, 19—30 X 19—26 fji, with numerous germ-pores, and mixed with nume- rous capitate paraphyses which are 10—14^ broad and as much as 80 fA, 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,.. 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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