Opuscula Philolichenum 5: 35 (2008).

Synonyms: Index Fungorum

Protolog: Chrysothrix saxicola ab aliis speciebus saxolis thallo tenui dispersoque, primo soraliis simili, demum plus minusve continuo areolatoque, sorediis 25-30 µm in diametro et calycin et acidum leprapinicum? continenti differt.

Protolog type data: Type. U.S.A. Missouri. Shannon Co.: Ozark National Scenic Riverway, in Prairie Hollow Gorge Natural Area, east of hwy V, W1/2 sec. 15 T29N R3W, on shaded rhyolite face under massive overhang on west-facing slope, 18 May 1995, Ladd 18690 (NY, holotype).

Type locality: USA, Missouri, Shannon County, Ozark National Scenic Riverway, in Prairie Hollow Gorge Natural Area, east of highway V, W1/2 sec. 15 T29N R3W, on shaded rhyolite face under massive overhang on west-facing slope, 18 May 1995, Ladd 18690 (NY - holotype).

Type locality coordinates: 37°11'26.52"N, 91°16'34.68"W; 37.1907, -91.2763.

Molecular barcode: Data lacking.

Thallus: crustose, leprose, thin to moderately thick, bright yellow to yellow-green or yellow-orange, unstratified, adnate, forming small, + round or irregular soralium-like colonies, one-few granules thick to 200 µm, often remaining discontinuous but also forming or coalescing into larger, continuous, rimose or rimose-areolate patches several cm. across and then to 500 µm thick; rhizohyphae absent; Granules farinose, + sphaerical, 20-50 m across; hyphae 2-2.5 µm wide. Apothecia unknown. Pycnidia unknown (Harris & Ladd 2008: 35).

Photobiont: chlorococcoid, spherical, 9-14 µm across (Harris & Ladd 2008: 35).

Chemistry: Chemistry: K+ reddish, C-, KC+ reddish, PD-, UV-; calycin (major) and leprapinic acid (?) (major), unknown pulvinic acid derivate (tr.) (Harris & Ladd 2008: 35).

Ecology: Data lacking.

Distribution: Database

Molecular data: Genbank

Mycobank: Mycobank

Note: "Chrysothrix insulizans may prove identical to the Australian and Asian C. occidentalis (Elix & Kantvilas 2007) but is maintained as distinct here mainly based on geography and a minor chemical difference (calycin minor in the latter)" (Harris & Ladd 2008: 35).

Pictures: Tropical Lichens