. Lichens. Lichens. STRUCTURES PECULIAR TO LICHENS 139 and lay like a cap over the top. The cephalodia described by Winter are endogenous in origin, though the mature body finally emerges from the interior and becomes either epigenous or hypogenous. Schneider^ has fol- lowed the development of a somewhat similar endotrophic or endogenous type. Fig. 78 B. Feltigera aphthosa Willd. Vertical section of thallus and cephalodium x 480 (after EabikofF). â in Sticta oregana due also to the presence of a species of Rivularia. How the alga attained its position in the medulla of the thallus was not obse
. Lichens. Lichens. STRUCTURES PECULIAR TO LICHENS 139 and lay like a cap over the top. The cephalodia described by Winter are endogenous in origin, though the mature body finally emerges from the interior and becomes either epigenous or hypogenous. Schneider^ has fol- lowed the development of a somewhat similar endotrophic or endogenous type. Fig. 78 B. Feltigera aphthosa Willd. Vertical section of thallus and cephalodium x 480 (after EabikofF). â in Sticta oregana due also to the presence of a species of Rivularia. How the alga attained its position in the medulla of the thallus was not observed. Both the algal cells of internal cephalodia and the hyphae in contact with them increase vigorously, and the newly formed tissue curving upwards or downwards appears on the outside as a swelling or nodule varying in size from that of a pin-head to a pea. On the upper surface the gonidial zone partly encroaches on the nodule, but the foreign alga remains in the centre of the structure well separated from the thalline gonidia by a layer of hyphae. The group is internally divided into small nests of dark-green algae surrounded by strands of hyphae (Fig. 79). The swellings, when they. 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 Smith, Annie Lorrain. Cambridge, At the University Press
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