. Fio. 130.—Sections of Maj^le leaves showing the upper epidermis ruistured by 1, Rhytisma ; 2, RhytUma punctatum. Fig. 131.—Rhytisma symmetricum Milll. Two leaves of Salix purpurea with stromata. A, The upper side. B, The lower side. C, Longitudinal section through the same leaf, showing numerous apothecia on the upper side, fewer on the lower ; the shaded middle part represents leaf-tissue, the remainder is the light fungal stroma in which the darker apothecia are embedded, (v. Tubeuf del.) Rh. salicinum Pers. (Britain and America). Thickened black wrinkled spots appear frequen
. Fio. 130.—Sections of Maj^le leaves showing the upper epidermis ruistured by 1, Rhytisma ; 2, RhytUma punctatum. Fig. 131.—Rhytisma symmetricum Milll. Two leaves of Salix purpurea with stromata. A, The upper side. B, The lower side. C, Longitudinal section through the same leaf, showing numerous apothecia on the upper side, fewer on the lower ; the shaded middle part represents leaf-tissue, the remainder is the light fungal stroma in which the darker apothecia are embedded, (v. Tubeuf del.) Rh. salicinum Pers. (Britain and America). Thickened black wrinkled spots appear frequently on living leaves of various species of willow, Salix Caprea, S. cinerca, etc., also on some alpine willows, S. reticulata. These contain apothecia of this fungus, which reach their full maturity during the second summer. ' Dyscomycopsis rhyttsmoides Ablill. Black spots similar to those of Rhytiama appear on the leaves of sj-camore. The black crusts are here only subcuticular and enclose a transparent tissue from which large spherical spores are produced. The systematic position of this fungus is unknown.
Size: 1643px × 3042px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
