. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 383 The secial stage of the former of these is not known. Its uredinia survive the severest winters even so far north as the Dakotas. P. coronata ;^' 2^«- ^ I (=iE. rhamni). Peridia often on very large orange swellings, causing great distortions on the leaves and peduncles, cylindrical, with whitish torn edges. Spores subglobose, very finely verrucose, orange-yellow, 15-25 x 12-18 fi. II. Uredinia orange, pXilverulent, elongated or linear, often con- fluent. Spores globose or ovate, with
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 383 The secial stage of the former of these is not known. Its uredinia survive the severest winters even so far north as the Dakotas. P. coronata ;^' 2^«- ^ I (=iE. rhamni). Peridia often on very large orange swellings, causing great distortions on the leaves and peduncles, cylindrical, with whitish torn edges. Spores subglobose, very finely verrucose, orange-yellow, 15-25 x 12-18 fi. II. Uredinia orange, pXilverulent, elongated or linear, often con- fluent. Spores globose or ovate, with three or four germ pores, echinulate, orange-yellow, 20-28 x 15-20 m- III. Telia persistent, black, linear, often confluent, long covered by the epidermis. Spores subcylindrical or cuneiform, attenuated below, constriction slight or absent, apex truncate,. M m mi ¥^ mf w Fig. 276.—P. coronata, various teliospore forms. After Bolley. somewhat thickened, with six or seven curved blunt processes, brown, 40-60 x 12-20 /i- Pedicels short, thick. Heteroecious; I, on Rhanmus frangula. II and III on various grasses but not on oats. From this form as earlier imderstood Klebahn has separated P. coronifera Kleb. on evidence derived from inoculations, and made the latter to include these forms with the secial stage on Rhamnus cathartica and the uredinial and telial stages on Avena, Lolium, Festuca, Holchus, Alopecurus and Glyceria. P. coronifera has been still further divided by Eriksson into eight biologic forms and P. coronata into three such forms.'"^ P. glumarum (Schm.) Er. & Hu.^^*' *™ is widely distributed on wheat, rye, barley and a few other grasses in India and Europe but is not known in America.'"* Its aecia are not known. By some this is regarded as a race of P. rubigo-vera. Both uredinia and teliospores have been reported in the pericarp of grains.'*. Please note that these images are extracted from scanned page images that may have been digitally enhanced
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
