A text-book of mycology and plant pathology . may occur in some species. The principal cereal orgrain rusts may be enumerated first, as they are fairly well known,owing to the researches of Eriksson and others: Black Rust of Cereals, Puccinia graminis (Fig. 64) with its aeciumon the barberry, Berbcris vulgaris. Six forms of this species may bedistinguished: (i) f. sp. Iriiici on wheat (seldom on rye, barleyand oats); (2) f. sp. secalis on rye, barley and couch grass, Agropyron 202 MYCOLOGY repens, Elymus arenarius, Bromus secalinus and others; (3) f. on oats and Avena elatior, Dactyl
A text-book of mycology and plant pathology . may occur in some species. The principal cereal orgrain rusts may be enumerated first, as they are fairly well known,owing to the researches of Eriksson and others: Black Rust of Cereals, Puccinia graminis (Fig. 64) with its aeciumon the barberry, Berbcris vulgaris. Six forms of this species may bedistinguished: (i) f. sp. Iriiici on wheat (seldom on rye, barleyand oats); (2) f. sp. secalis on rye, barley and couch grass, Agropyron 202 MYCOLOGY repens, Elymus arenarius, Bromus secalinus and others; (3) f. on oats and Avena elatior, Dactylls glomerata, Alopecurus prafen-sis, Milium efusum, etc.; (4) f. sp. pom on Poa compressa and P. praten-sis; (5) f. sp. airce on Aira ccespitosa and ^. bottnica; (6) f. sp. agrostis onAgrostis canina and A. stolonijera. Brown Rust of Rye, Puccinia dispersa, with its cluster cups onAnchusa arvensis and A. officinalis. Crown Rust of Oats, Puccinia coronifera, with its aecium on thebuckthorn, Rhamnus cathartica. Of this species there are eight. Fig. 71.—A-C, Gymnoconia interstitialis. A, .i^cidia on leaf of Ruhus canadensis;B, piece of leaf enlarged; C, teliospore; D, teliospore oi Sphenospora pallida, 500/ i.(After Dietel: Die natiirlichen Pflanzenfamilien I. lA**, p. 70.) speciaHzed forms, as follows: (i) f. sp. avencB on oats; (2) f. sp. alope-curi on Alopecurus pratensis; (3) f. sp. festucce on Festucas; (4) f. on rye grass, Lolium perenne; (5) f. sp. glyceric^ on Glyceria aqua-tica; (6) f. sp. agropyri on Agropyron repens; (7) f. sp. epigm on Cala-magrostis epigeios; (8) f. sp. hold on Holcus lanatus. Crown Rust of Grasses, Puccinia coronaia, with its aecium on Rham-nus jrangula. Three special forms of this rust are known: (i) f. on Calamagrostis arundinacea; (2) f. sp. phalaridis on 1 Arthqr, J. C. and Kern, F. D.: North American Species of Torr. Bot. Clnb, 33: 403-438, 1906. RUST FUNGI 203 P/nilaris arnudinacca; (,•;) f. sp. a
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