. Lichens. Lichens. RADIATE THALLUS 105 In Letharia {L, vulpina, etc.) the structure is midway between Ranialina and Usnea: the central axis is either a soHd strand of chondroid hyphae or several separate 'â 'â¢Co Vi^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 Smith, Annie Lorrain. Cambridge, At the University Press

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