. Introduction to the study of fungi, their organography, classification, and distribution for the use of collectors . 232 INTRODUCTION TO THE STUDY OF FUNGI place, by the concentration of the denser portion in the centre,in the form of a sphere, involved in a delicate membrane,surrounded by a hyaline layer of protoplasm. At this timethe antheridmm is being developed from a lateral branch ofthe hypha, just below the oogonium (Fig. 107). When fullydeveloped tliis organ is elliptical or obovate, smaller than theoogonium, and filled with granular protoplasm; cut off at thebase from connection wit
. Introduction to the study of fungi, their organography, classification, and distribution for the use of collectors . 232 INTRODUCTION TO THE STUDY OF FUNGI place, by the concentration of the denser portion in the centre,in the form of a sphere, involved in a delicate membrane,surrounded by a hyaline layer of protoplasm. At this timethe antheridmm is being developed from a lateral branch ofthe hypha, just below the oogonium (Fig. 107). When fullydeveloped tliis organ is elliptical or obovate, smaller than theoogonium, and filled with granular protoplasm; cut off at thebase from connection with the hypha by a transverse that the oosphere is formed, and the antheridiumperfected, the latter comes in contact with the former, and, atthe point of contact a slender tube is projected through the wallof the oogonium, which grows until it reaches the surface of the. Fig. 107.—Perijaosj)ura. o, young state ; h, formation of oosphere ;c, after fertilisation. After De Bary. oosphere. Meanwhile the contents of the antheridium under-go change : towards the centre they are more dense, and, as thefertilisation tube becomes complete, this portion passes downit and mingles with the protoplasm of the oosphere, and theconnection is complete. The oosphere is fertilised, and, secret-ing a thick wall, becomes an oospore, a resting spore, analogousto the zygospore of the Mucoraceae. Gradually, by the decayand dissolution of the hyphae, these oospores become free,hybernating amidst the decaying tissue of the foster-plant,and awaiting rejuvenescence in the spring. When the latterperiod arrives the contents of the oospore, in most species,become differentiated into a host of minute active zoospores,similar to those evolved from the differentiated gonidia, and,by rupture of the wall of the mother cell, become diffused andready to attach and establish themselves u
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Keywords: ., bookauthorcookemcm, bookcentury1800, bookdecade1890, bookyear1895
