Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 VALSA. 225 where leaves of the alder are dried in summer for use as winter-fodder for goats. In the branches attacked, a mycelium is developed in the vessels of the wood, whereby the supply of water is stopped and the bark dries up. Black lens-shaped stromata arise under the epidermis of the twig and rupture it. The perithecia are produced under the stromata in the bark, and communicate o cfc) i-*
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 VALSA. 225 where leaves of the alder are dried in summer for use as winter-fodder for goats. In the branches attacked, a mycelium is developed in the vessels of the wood, whereby the supply of water is stopped and the bark dries up. Black lens-shaped stromata arise under the epidermis of the twig and rupture it. The perithecia are produced under the stromata in the bark, and communicate o cfc) i-*:i-i?.i»ifv- iT»fi >•- ---?SS'?5*_ FiG. W9.— Valsa on Alnus viridi*. A, Portion of branch with stroma of Valsa breaking through the periderm at four places. B, EnLirged section through a stroma from A. C, Asei and ascospores, isoLited from a porithecium. Z), Portion of younger branch with periderm ruptured by .stromata, in which, however, the perithecia are not yet developed. E, Enlarged section tlirou>.'h :i stroma of D. (After v. Tubeuf.) with the exterior by means of long projecting necks. llie asci contain eight unicellular spores of a slightly bent, rod- like shape. Maturity is reached on the dry dead twigs. Externally this disease is identical in appearance with one I ascertained to be due to a beetle {Cryiitorhynchm lapathi), p
Size: 1509px × 1325px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
