. Fungi; their nature, influence, and uses;. Fungi. â Pseudospore of UsHlago recep- Ustilago as have been remarked in the sporules of the first generation in Tilletia. Returning to Ci/stopus, as the last of the Uredines, we must briefly recapitulate the observations made by Professor de Bary,* â who, by the bye, claims for them an affinity with Peronospora (Mncedines but too well known in connection with the potato disease), and not with the Ure- dines and their allies. In this genus there are two kinds of reproductive organs, those pro- duced on the surface of the plant bursting through the c
. Fungi; their nature, influence, and uses;. Fungi. â Pseudospore of UsHlago recep- Ustilago as have been remarked in the sporules of the first generation in Tilletia. Returning to Ci/stopus, as the last of the Uredines, we must briefly recapitulate the observations made by Professor de Bary,* â who, by the bye, claims for them an affinity with Peronospora (Mncedines but too well known in connection with the potato disease), and not with the Ure- dines and their allies. In this genus there are two kinds of reproductive organs, those pro- duced on the surface of the plant bursting through the cuticle in white pustules, and which I)e Bary terms COnidia, which are taculormn in germination, and secondary , T . , , - , . spores in conjugation. (Tul.) generated m chains, and certain globose bodies termed oogonia, which are developed on the mycelium in the internal tissues of the foster plant. When the conidia are sown on water they rapidly absorb the moisture, and swell; the centre of one of the extremities soon becomes a large obtuse papilla resembling the neck of a bottle. This is filled with a granular protoplasm, in which vacuoles are formed. Soon, however, these vacuoles disappear, and very fine lines of demarcation separate the pro- toplasm into from five to eight Fig- 91.âConidia and zoospores of Cy»- , , , . , topus Candidas; a, conidium with Ihe polynedric portions, each pre- plasma divided; b. zoospores escaping ; ,. Tiii J? ⢠LI 1 J C' zoospores escaped from the conidium; Senting a little lamtJy-COlOUred .(.active zoospores;?. zoospores, having lost vacuole in the centre (a). Soon ^^^^ '="^' '=°"â¢â¢'^i"i *" s»rmii>ate. after this division the papilla at the extremity swells, opens itself, and at the same time the five to eight bodies which had formed in the interior are expelled one by one (J). These are zoospores, * De Bary, " Recherches," &c. in " Annales des Sciences Naturelles " (4â¢"
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Keywords: ., bookauthorcookemcm, bookcentury1800, bookdecade1880, bookyear1888
