. Lichens. Lichens. 134 MORPHOLOGY As cephalodia contain rather dark-coloured, blue-green algae, they are nearly always noticeably darker than the thalli on which they grow, varying from yellowish-red or brown in those of Lecanora gelida to pale-coloured in. Fig. 76. Ricasolia amplissima de Not. [Lobaria laciniata Wain.) on oali, reduced. The dark patches are tufts of branching cephalodia (A. Wilson, Photo.]. Lecidea consentiens^, a darker red in Lecidea panaeola and various shades of green, grey or brown in Stereocaidon, Lobaria {Ricasolia), etc. They form either flat expansions of varying si
. Lichens. Lichens. 134 MORPHOLOGY As cephalodia contain rather dark-coloured, blue-green algae, they are nearly always noticeably darker than the thalli on which they grow, varying from yellowish-red or brown in those of Lecanora gelida to pale-coloured in. Fig. 76. Ricasolia amplissima de Not. [Lobaria laciniata Wain.) on oali, reduced. The dark patches are tufts of branching cephalodia (A. Wilson, Photo.]. Lecidea consentiens^, a darker red in Lecidea panaeola and various shades of green, grey or brown in Stereocaidon, Lobaria {Ricasolia), etc. They form either flat expansions of varying size on the upper surface of the thallus, rounded or wrinkled wart-like growths, or upright branching structures. On the lower surface, where they are not unfrequent, they take the form of small brown nodules or swellings. In a number of species packets of blue- green algae surrounded by hyphae are found embedded in the thallus, either in the pith or immediately under the cortex. They are of the same nature as the superficial excrescences and are also regarded as cephalodia. 1 Leigh ton 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
Size: 1662px × 1504px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublishercambr, bookyear1921
