Chrysothrix chlorina (Ach.) J.R.Laundon

Description

Description : (From Harris & Ladd 2008) - Thallus thick, continuous to strongly areolate, bright yellow, ecorticate, loosely attached and easily separated from rock, lacking well-defined lobes, forming extensive, irregularly spreading patches, to ca. 1.0 mm thick, +/- densely compact in central parts, consisting of yellow granules which become paler toward base; rhizohyphae not evident to well developed; photobiont chlorococcoid, spherical, to 18 µm across. Granules variable, spherical or +/- irregular, 40.75 µm across (100-200 µm, Laundon, 1981), occasionally with projecting hyphae; hyphae colorless, 2.0-5.0 µm thick. Apothecia not seen. Pycnidia not seen.

Illustrations: Color illustration: Harris and Ladd (2008; Opuscula Philolichenum, 5: 32, pl. 1, fig. 6).

Chemistry: (From Harris & Ladd 2008) - Chemistry: +/-, KC+/- reddish, C-, PD-, UV-; calycin, vulpinic acid and zeorin (minor) (not usually reported for C. chlorina but was found also by Tonsberg 1992).

Discussion: (From Harris & Ladd 2008) - Chrysothrix chlorina is separated from the morphologically similar C. onokoensis by chemistry (calycin, vulpinic acid and zeorin vs. leprapinic? acid), and to a lesser extent in more frequently having the granules without projecting hyphae compacted into a denser crust which is not obviously bicolor in section (lacking a distinct layer of rhizohyphae in eastern North American material) although the lower parts may be paler. From the limited material examined, C. chlorina seems to have a distinctly northern distribution in eastern North America.

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