. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. OOSPOBEJE. 135 ferm, as white, blister-like patches, the conidia are produced just beneath the epidermis, •which becomes ruptured, and allows their escape. In Peroiiospora, as the Grape-Mildew (P. viticola), the Potato Fungus (P. infestans), the white, frost-like down on Peppergrass (P. parasitica), etc., the conidia are produced on aerial - branches of the hyphse growing from the stomates (Fig. 250). The conid
. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. OOSPOBEJE. 135 ferm, as white, blister-like patches, the conidia are produced just beneath the epidermis, •which becomes ruptured, and allows their escape. In Peroiiospora, as the Grape-Mildew (P. viticola), the Potato Fungus (P. infestans), the white, frost-like down on Peppergrass (P. parasitica), etc., the conidia are produced on aerial - branches of the hyphse growing from the stomates (Fig. 250). The conidia quickly germinate, and in some species give rise directly to a filament; in other species, swarm-spores, each with two cilia, are formed, which, after coming to rest, send out germinating filaments; these pass into the host-plant, either growing through the stomates, or boring directly through -the epidermis, where numerous hyphse are again pro- duced. The sexual reproduction takes place, by means of oogouia and antheridia (Fig. 247). i6g. The Fucoidese are also representatives of the Oosporese. They are marine Algse, whose green, or chlorophyll, is con- cealed by a reddish-brown color- ing matter. They are often of great size and present considerable differentiation of tissue, not found in the Thallophytes previously mentioned. They may be flat, or strap-shaped, and several yards in length, as in Laminaria; they may be tree-like iu form and size, twenty to thirty feet in height, as in Lessonia; or, like a gigantic pinnate leaf, sometimes more than three hundred feet long, as Maerocystis. The outer tissues are generally dense, and formed of small and crowded cells; the inner cells are mostly elongated and loosely joined, so as to Fig. 2.'>0, Conidia of Peronospora; /i, hyphifi; J/*, conidia; si, stomates; g-d, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearan
Size: 1377px × 1814px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1883
