. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. Fig. 104. SclerotiniaScIerotiorum. Thin ver- tical sectioQ tliTOD^h the periphery of a sdero- tium which has been kept moist and is ready to develope; beneath the black rind is the primordium of a sporocarp. The dark angular bodies are calcium oxalate. Magnisotimcs. See also Fig. 14. Fig. 105. ScUroliniaScUrotiorum. Medlansection through a young sporocarp which is bursting through the rind. Magn. go times, but completed from higher enlargements. of the whole body all
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. Fig. 104. SclerotiniaScIerotiorum. Thin ver- tical sectioQ tliTOD^h the periphery of a sdero- tium which has been kept moist and is ready to develope; beneath the black rind is the primordium of a sporocarp. The dark angular bodies are calcium oxalate. Magnisotimcs. See also Fig. 14. Fig. 105. ScUroliniaScUrotiorum. Medlansection through a young sporocarp which is bursting through the rind. Magn. go times, but completed from higher enlargements. of the whole body all possibility of distinguishing them ceases. But it is not improbable that the difference reappears with the formation of the ascus, in other words, that the hyphae which have proceeded from the primordiiun are the ascogenous hyphae and the primordium is therefore an ascogonium, while the envelope-apparatus of the sporocarp with the paraphyses comes from the peripheral hyphae; and thus the young sporocarp contains from the first the two elements side by side, though they are not anatomically different. The original structure of the primordium is obscured after the emergence of the sporocarp, but its place usually continues to be distincdy marked by the brown colour of the walls of the medullary cells at its circumference; this however may often ultimately spread to the primordium also. The number of primordia in a sclerotium is always much larger than that of the sporocarps which are matured; many are obliterated by their peripheral cells turning brown or are destroyed by the emergence of neighbouring sporocarps, Sclerotinia Fuckeliana shows phenomena of development quite similar to those which have been described; but there is one difference which adds greatly to the difiBculty of obser- vation : the primordia are not formed inside, but on the surface of the sclerotium. A thin bundle of hyphae from the medullary tissue bursts through the rind and developes on its outer surface i
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