. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 288 TRIPHRAGMIl M Spermogones. On the leaves and petioles, circulate, flat, yellowish. Uredospores. Sori of two kinds 'primary, caeomata, amphigrimiis, large, expanded, bright-orange, mostly on the veins and petioles where they cause distortion, without para- physes; secondary, hypophyllous, small, round, scattered, orange, surrounded by paraphyses; spores brilliant-orangt . ellipsoid to obovate, verrucose, 25—28x18—21 fi, without evident germ- Fig. 218. T. Ulmariae. Normal telento
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 288 TRIPHRAGMIl M Spermogones. On the leaves and petioles, circulate, flat, yellowish. Uredospores. Sori of two kinds 'primary, caeomata, amphigrimiis, large, expanded, bright-orange, mostly on the veins and petioles where they cause distortion, without para- physes; secondary, hypophyllous, small, round, scattered, orange, surrounded by paraphyses; spores brilliant-orangt . ellipsoid to obovate, verrucose, 25—28x18—21 fi, without evident germ- Fig. 218. T. Ulmariae. Normal telentospore; a and b, two abnormal ones ; on S. Ulmaria. Teleutospores. Sori hypophyllous, small, round, brownish- black, persistent, but pulverulent, sometimes arising in the primary uredo-sori; spores subglobose, flattened, chestnut- brown, more or less rough with obtuse warts, 35—49 \i; each cell has, at a point opposite to the inner corner, a germ-pore round which the warts are often crowded; pedicels colourless, persistent., variable in length: abnormal spores may have two or four to five cells. ()n Spiraea Ulmaria, S. Filipendula. Very common on the ft inner host. Primary uredospores, May—July; teleutospores, August—November. (Fig. 218.) The primary uredo-sorus may be looked upon as a cseoma, an recidium, and in any case it corresponds to that developmental stage ; Klebahn proved (Zeitschr. f. Pflanzenkr. 1907) that it is produced by infection by the basidiospores. Dietel observed that, in elevated situations, the secondary uredo-spore generation on S. Ulmaria was almost absent, and the teleutospores arose in connection with the primary uredo-sori ; this is in agreement with the usual shortening of the life-history that. 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 Byw
Size: 2181px × 1146px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambr, bookyear1913
