. Lichens. Lichens. 6o CONSTITUENTS OF THE LICHEN THALLUS There is some confusion as to the genera of algae that form the gonidia of these epiphyllous lichens. Phyllactidium given by Zahlbruckner as the gonidium of all the Strigulaceae (except Strigula in part) is classified by de Toni' as probably synonymous with Phycopeltis Millard, and as differing from Mycoidea parasitica in the mode of growth. Fam. Prasiolaceae. Thallus filamen- tous, often expanded into broad sheets by the fusion of the filaments in one Fig. 32. Phycopeltis expansa Jenn. â much magnified (after Vauglian Jennings)

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. Lichens. Lichens. 6o CONSTITUENTS OF THE LICHEN THALLUS There is some confusion as to the genera of algae that form the gonidia of these epiphyllous lichens. Phyllactidium given by Zahlbruckner as the gonidium of all the Strigulaceae (except Strigula in part) is classified by de Toni' as probably synonymous with Phycopeltis Millard, and as differing from Mycoidea parasitica in the mode of growth. Fam. Prasiolaceae. Thallus filamen- tous, often expanded into broad sheets by the fusion of the filaments in one Fig. 32. Phycopeltis expansa Jenn. â much magnified (after Vauglian Jennings). Prasiola Ag. Thallus,filamentous, of one- to many-cell rows, or widely expanded (Fig. 33). The gonidium of Mastoidiaceae (Pyreno- carpeae).. 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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