. Lichens. Lichens. Fig. 5. Endocarpon pusillum Hedw. Asci and spores, with hymenial gonidia x 320 (after Stahl).. Fig. 6. Endocarpon ptisillum Hedw. Spore germinating in contact with hymenial gonidia x 320 (after Stahl). ' The authors quoted have been followed in their designation of the various green algae that form lichen gonidia; It is however now recognized (Wille 1913) that either Protococcus viridis Ag., ChloreUa or other Protococcaceae may form the universal green coating on trees, etc., and be incorporated as lichen gonidia. Fleurococcus vulgaris Naeg. and Pleurococcus Naegeli Chod. a
. Lichens. Lichens. Fig. 5. Endocarpon pusillum Hedw. Asci and spores, with hymenial gonidia x 320 (after Stahl).. Fig. 6. Endocarpon ptisillum Hedw. Spore germinating in contact with hymenial gonidia x 320 (after Stahl). ' The authors quoted have been followed in their designation of the various green algae that form lichen gonidia; It is however now recognized (Wille 1913) that either Protococcus viridis Ag., ChloreUa or other Protococcaceae may form the universal green coating on trees, etc., and be incorporated as lichen gonidia. Fleurococcus vulgaris Naeg. and Pleurococcus Naegeli Chod. are synonyms oi Proto- coccus viridis. In that alga there is no pyrenoid, and no zoospores are formed. The genus Cystococcus, according to Chodat (1913), is characterized by the presence of a pyrenoid and by reproduction with zoospores and is identical with Pleurococcus vulgaris Menegh. (non Naeg.)', though Wille regards Meneghini's species as of content. Paulson and Hastings (1920) now find that Chodat's pyrenoid is the nucleus of the cell. ' Woronin 1872. = Archer 1873, 1874, 1875. « Bornet 1873 and 1874. 'Treubi873. « Borzi 1875. ' Stahl 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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