. Introduction à l'étude des champignons ; leur organography, classification, et la distribution, à l'usage des collectionneurs. Les champignons. Conjuguant LES CHAMPIGNONS PHYCOMYCÈTES 231-germe à la fois par l'intermédiaire d'un pore latéral, mais dans le dernier cas, une étape intermédiaire intervient. Quand gonidium a chaque maturité plus turbides, matières qui sont vus à s'accumuler dans plusieurs centres, et puis de devenir divisé par la croissance d'une membrane sur chaque segment, en cellules internes distinctes, chacune avec un noyau. Bientôt, le mur de la cellule-mère est rup- ment, et le con- tentes s'échapper, aujourd'hui différenciés en trois ou quatre, ou

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. Introduction to the study of fungi; their organography, classification, and distribution, for the use of collectors. Fungi. CONJUGATING FUNGI—PHYCOMYCETES 231 germinate at once through a lateral pore, but in the latter case an intermediate stage intervenes. Each gonidium when mature has more turbid contents, which are seen to accumulate in several centres, and then to become divided by the growth of a membrane about each segment, into distinct inner cells, each with a nucleus. Soon the wall of the mother cell is rup- tured, and the con- tents escape, now differentiated into three or four, or more, smaller but similarly shaped bodies, armed with a pair of vibra- tile cilia, by means of which they move actively in any drop of moisture with which they may come in contact, trans- FlG> 1°6.-Gonidiopliore of Peronoxpora. formed into secondary gonidia or zoogonidia, sometimes called zoospores. In this condition they move about for some time over the moist surface of the leaf upon which they are discharged, until at length they come to rest, lose their cilia, and commence germination, by the production of a delicate germ-tube which enters the stomata of the fostering plant, and form a mycelium beneath the surface. From this my- celium spring erect hyphae, which seek the air, and, becoming branched, constitute new gonidiophores, and the cycle is complete. The sexual reproduction takes place within the host-plant, by the production of oogonia upon branches of the mycelium. They originate as spherical swellings at the end, or inter- calated in the hyphae, and after a time reach a considerable volume, and contain a dense protoplasm with oil drops. Soon these swellings are isolated by the production of a septum across the hypha when terminal, or above and below when intercalary. After this differentiation of the oosphere takes. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appea

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