. Introduction to the study of fungi, their organography, classification, and distribution for the use of collectors . Fig. 37. — Oogonium withtwo oospheres of De Bary. FERTlLISAriON 6i extremity and become clavate, to form antlieridia, and one ofthese applies itself by the obtuse extremity to the face ofeach oogonium. With this development the contents of tlieoogonium become aggregated into a spherical form in thecentre to constitute a gonosphere. A slender tube is projectedfrom the applied end of the antheridium into the oogoniumuntil it reaches tlie gonosphere, when it ceases f
. Introduction to the study of fungi, their organography, classification, and distribution for the use of collectors . Fig. 37. — Oogonium withtwo oospheres of De Bary. FERTlLISAriON 6i extremity and become clavate, to form antlieridia, and one ofthese applies itself by the obtuse extremity to the face ofeach oogonium. With this development the contents of tlieoogonium become aggregated into a spherical form in thecentre to constitute a gonosphere. A slender tube is projectedfrom the applied end of the antheridium into the oogoniumuntil it reaches tlie gonosphere, when it ceases further this contact the gonosphere becomes invested with amembrane of cellulose. Its subsequent progress, as it becomesmature, is to develop a thick brown epispore, and then cometo rest during the winter months. In the Entumojyhthoraccae, or tly moulds, the process of b. Fig. 38.—Sexual orgaus of Peronospora. After De Bary. sexual reproduction is more shnple. They are produced byslightly varying modes, as a result of the conjugation ofopposite threads. These hyphae, either within or without thebody of the host, produce lateral outgrowths at opposite pointsof two different threads, which meet midway between the twoconjugating cells, and coalesce. The intermediate walls areabsorbed, and a connecting tube is formed, through which tliecontents are mingled (Fig. 39). A gemma is produced on theconnecting canal, which increases rapidly, appropriating thecontents of the two conjugating cells to form a this the empty hyphae disappear. This process may beslightly modified in different species, but it follows the sameprinciple, and the mature zygospore passes into a period ofrest.^ This much is known of sexual rcproduclicm in Fungi: that1 Vegetable Wasps and Plant Worms, by M. C. Cooke (18512), p. 11. 62 INTRODUCTION TO THE STUDY OF FUNGI in th
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