. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. l62 DIVISION II.—COURSE OF DEVELOPMENT OF FUNGI. very thick, and many-layered membranes, the outer layers of which, the epi- sporium, are coloured and sclerosed in many species, in some are furnished with wart-like or slender spike-like prominences; they may also be known by their very dense protoplasm containing a large quantity of fatty matter uniformly distributed in small drops or granules, as in species of Synchytrium, or aggregated into a few drops or into one c
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. l62 DIVISION II.—COURSE OF DEVELOPMENT OF FUNGI. very thick, and many-layered membranes, the outer layers of which, the epi- sporium, are coloured and sclerosed in many species, in some are furnished with wart-like or slender spike-like prominences; they may also be known by their very dense protoplasm containing a large quantity of fatty matter uniformly distributed in small drops or granules, as in species of Synchytrium, or aggregated into a few drops or into one comparatively large round drop, as in Polyphagus, Chytridium Brassicae, Won, Rhizidium mycophilum, A. Br., Chytridium OUa. The resting-spores remain dormant for some time before germinating. If we next endeavour to form an idea of the course of development in the Chytridieae, we shall find that our present knowledge permits of our distinguishing four types, which might perhaps be combined by pairs into two main types. Each of these has one or more chief representatives, and each of these again has a crowd of imperfectly known forms doubtfully associated with it. There are no distinctly intermediate forms between the two Fig. 75. Polyphagus EugUnae. A swarm-spore with sphere of fatty matter and nucleus. B young plant grown from a swarm-spore with a branch oftherhizoid attached to a resting Eugiena e. C zoosporangium with formation of spores just completed and resting on the empty mother-vesicle a (prosporangium) from which it has proceeded; on the vesicle are three rhizoid-branches. D conjugation; a the receptive individual, b the supplying individual, t the swollen end of the tube of conjugation connecting a and b, which end is becoming the rudiment of the resting spore, ee the Euglenae attacked by the Polyphagi. E a portion of the pair shown in Z> 5^ hours later than D; b and s indicate the same parts as in i>, ^ empty, j mature. After Nowakowski. A magn. 550,
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