. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. mmmm m49s v 2t .WffiR SKpiills^l^. Fig. 172. Physcia parietina, Kbr. Section through the young thallus ; 0 upper rind-layer, 71 under rind-layer, g- algal zone {Cystococcus). After Schwendener. Magn. 500 times. FIG. 173. Sticlafitliginosa. Transverse section through the foliaceous thallus ; the letters as in Fig. 172, also m medullary layer, r rhizoid strands. The algal zone here consists of a species of Chroo- coccus with thick colourless gelatinous membrane and bluish green
. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. mmmm m49s v 2t .WffiR SKpiills^l^. Fig. 172. Physcia parietina, Kbr. Section through the young thallus ; 0 upper rind-layer, 71 under rind-layer, g- algal zone {Cystococcus). After Schwendener. Magn. 500 times. FIG. 173. Sticlafitliginosa. Transverse section through the foliaceous thallus ; the letters as in Fig. 172, also m medullary layer, r rhizoid strands. The algal zone here consists of a species of Chroo- coccus with thick colourless gelatinous membrane and bluish green protoplasm which is black in the figure. After Sachs. Magn. 500 times. thickness, caused by the formation and insertion of new hyphal branches and algal cells and also by the increase in volume of those previously formed. The ramifications also in the foliaceous and fructicose thallus proceed from the hyphal system. They are partly bifurcations, and partly arise 'adventitiously' at points not in most cases very exactly and morphologically defined. The structure also of the mature heteromerous thallus (Figs. 171-173) is in its ground-plan that of the Fungus-body of the Lichen. We may as a rule distinguish in it a comparatively thin (its average thickness is about 10 n) usually transparent dense peripheral rind-layer (stratum corticale) clothing the free surface and a weft beneath the rind which is usually loose and everywhere furnished with interstices containing air, the medulla or medullary layer (stratum d d 2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bary, A. de (Anton), 1831-1888; Balfour, Isaac Bayley, 1853-1922. Oxford : Clarendon Press
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