. Lichens. Lichens. STRATOSE THALLUS 89 into short cells and a kind of plectenchyma is formed, as in Lecanora {Psoroma) hypnorum, in Endocarpan, etc.. Fig. 49. Parmelia caperata Ach. (S. H., Photo.). The felted medulla is characteristic of most lichens and is formed of loose slender branching septate hyphae with thickish walls. This interwoven hyphal texture provides abundant air-spaces. Hue^ has noted that the walls of the medullary hyphae in Parmeliae are smooth, unless they have been exposed to great extremes of heat or cold, when they become wrinkled or scaly. They are very thick-walled in
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. Lichens. Lichens. STRATOSE THALLUS 89 into short cells and a kind of plectenchyma is formed, as in Lecanora {Psoroma) hypnorum, in Endocarpan, etc.. Fig. 49. Parmelia caperata Ach. (S. H., Photo.). The felted medulla is characteristic of most lichens and is formed of loose slender branching septate hyphae with thickish walls. This interwoven hyphal texture provides abundant air-spaces. Hue^ has noted that the walls of the medullary hyphae in Parmeliae are smooth, unless they have been exposed to great extremes of heat or cold, when they become wrinkled or scaly. They are very thick-walled in Pelti- gera (Fig. 50). /I' 0 I J. 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 work.. Smith, Annie Lorrain. Cambridge, At the University Press