. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. CHA PTER V.—COMPA RA TIVE REV IE W.—HYMENOMYCE TES, *93 covered by the volva and borne on the broad and stoutly conical stipe-primordium (Fig. 135 a). At first only the upper surface of the pileus appears distinct and separate from the volva; then the commencement of the hymenial layer or the lamellae is seen in the general shape of a narrow ring beneath the upper surface of the pileus and separated from the volva by a layer of tissue, the future body of the pileus (b, c). Al
. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. CHA PTER V.—COMPA RA TIVE REV IE W.—HYMENOMYCE TES, *93 covered by the volva and borne on the broad and stoutly conical stipe-primordium (Fig. 135 a). At first only the upper surface of the pileus appears distinct and separate from the volva; then the commencement of the hymenial layer or the lamellae is seen in the general shape of a narrow ring beneath the upper surface of the pileus and separated from the volva by a layer of tissue, the future body of the pileus (b, c). All the principal parts of the structure are now commenced; the whole tuber has reached a size of 10-20 mm., being irregularly ellipsoid in shape and having towards the apex a deep depression with thickened and rounded edges, in the middle of which the young pileus with the volva forms a regularly shaped J o cushion-like prominence. All these parts are shown succes- sively and sharply defined in section, most sharply in a me- dian longitudinal section, but none of them with distinct edges bounded by ever so small a gap. The definition is entirely due to the fact that the structure is different in the different parts; the young hy- menium, the outer surface of the pileus, and a strip which runs vertically from this into the middle of the stipe are formed of slender hyphae and have little air or none in the interstices of the weft; they thus have an aqueous trans- parence and are contrasted with the tissue round them, which is white in colour from the presence of broader inter- stices filled with air and has inflated hyphal cells among its narrowly cylindrical elements. If the air is removed the sharp- ness of the definition at once disappears. It should be particularly observed that the hymenial layer, which received a passing notice above, is seen to be separated into the future lamellae from the moment that it first becomes visible ; these appear as plates of tissue stretchi
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisheroxfor, bookyear1887
