Parmotrema adspersum (Vain.) Elix

Pseudoparmelia adspersa

Pseudoparmelia adspersa (Vainio) Hale, 1974:189.

Parmelia adspersa Vainio, 1907:168 [type collection: Lem Ngob, Siam, Schmidt XV (TUR, lectotype; C, isolectotype)].

Parmelia filipina Hale, 1972a:99 [type collection: Tagaytay, Cavite, Philippine, Hale 26809 (US, holotype; TNS, UPS, isotypes)].

DESCRIPTION.—Thallus adnate on trunks, whitish ashy gray, 5–8 cm broad; lobes subrotund, 3–6 mm wide, the upper surface plane, continuous or finely cracked with age, densely isidiate, the isidia mostly simple, cylindrical, 0.1–0.15 mm high, 0.05 mm in diameter; lower surface black except for a narrow dark brown zone along the margins, sparsely to moderately rhizinate. Apothecia (from Hale 26976) rare, substipitate, 2–4 mm in diameter, the amphithecium isidiate; spores 8, 5 × 10–12 μm.

CHEMISTRY.—Cortex K+ yellow, medulla K−, C−, KC−, P+ red; atranorin, fumarprotocetraric acid, and succinprotocetraric acid.

DISTRIBUTION.—Philippines, Thailand.

HABITAT.—Planted Casuarina trees at low to mid elevation (200–2000 m).

Parmotrema adspersum is a species of lichen in the family Parmeliaceae. It was originally described as a species of Parmelia by Edvard August Vainio in 1907. John Elix transferred it to Parmotrema in 2002, reasoning that its thick-walled ascospores (measuring 16–18 by 6–8 μm) are typical of that genus. Parmotrema adspersum is common in Thailand and the Philippines.