. Fig. 175.—Ttiburcinia trieatalis. Spore- Fig. 176.—Apex of an isolated promy- mass germinating; several promycelia have celium from Fig. 175 ; it carries a whorl of been produced and are proceeding to form branches, some of which have fused in pairs; whorls of branches. (After Woronin.) all are developing conidia. (After Woronin.) spaces of the pith and rind-parenchyma, also the vessels. The hyphae apply themselves closely to the cell-walls, and certain short branched hyphae actually penetrate into the cells. The spore-masses are developed from delicate branched multiseptate filaments of the
. Fig. 175.—Ttiburcinia trieatalis. Spore- Fig. 176.—Apex of an isolated promy- mass germinating; several promycelia have celium from Fig. 175 ; it carries a whorl of been produced and are proceeding to form branches, some of which have fused in pairs; whorls of branches. (After Woronin.) all are developing conidia. (After Woronin.) spaces of the pith and rind-parenchyma, also the vessels. The hyphae apply themselves closely to the cell-walls, and certain short branched hyphae actually penetrate into the cells. The spore-masses are developed from delicate branched multiseptate filaments of the vegetative mycelium. They begin as two or three little cells round which a coil of hyphae is formed ; the central cells, increasing in number and size, become a ball of dark smooth-coated spores, while the enveloping coil of hyphae disappears. The spores germinate during the same autumn, frequently in the position of their formation. A promycelium is first formed, and on its extremity a circlet of conidia arises ; there-
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897
