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Dibaeis absoluta (Tuck.) Kalb & Gierl
Family: Icmadophilaceae
[Baeomyces absolutus Tuck.,  more]
Dibaeis absoluta image
Troy McMullin  
Primary thallus: mostly forming only a thin, varnish-like film over the substrate, inconspicuous, often scarcely visible podetia: absent or very short, often immersed in the substrate, up to 1 mm tall, 0.5-1 mm diam., narrow at the base, wider above, finally going over the disc margin, weakly but distinctly channeled or longitudinally folded, mostly concolorous with the apothecia. surface: emerald green to gray when fresh, becoming brownish to beige, mostly smooth, scarcely cracked, rarely with calcium oxalate excretions, without soredia Apothecia: solid in longitudinal section, rose, pale rose to pale beige or ivory white, round, 0.5-2 (-3) mm diam.; disc: plane to uneven, often slightly funnel-shaped, pruinose in the center; margin: sometimes visible, narrow, swollen, rose-red [in non-Sonoran material], becoming convex towards the inside; hymenium: c. 120 µm, the upper 20 µm with lichen substances asci: 65-80 x 8 µm wide, (4-) 8-spored ascospores: ovoid to oblong-ellipsoid, hyaline, simple, (9-) 1.7 ± 1.38 x 4.58 ± 0.64 µm, L:W = 3 Spot tests: thallus and apothecia K+ yellow, C-, KC+ orange, P+ orange, UV+ orange Secondary metabolites: baeomycesic and squamatic acids (both major), and barbatic acid (accessory). Substrate and ecology: on rock, soil, loam, loamy rock walls, sandstone World distribution: pantropical to subtropical, particularly in the Americas, Asia and Australasia Sonoran distribution: known from several collections from a single locality in central Sinaloa, 2300-2320 m, on soil over acidic rock in pine-oak forest, and on road bank. Notes: This species is characterized by an inconspicuous, smooth thallus that contrasts with the pale, rose-colored, plane, small, almost sessile, rounded apothecia.
Dibaeis absoluta image
Troy McMullin  
Dibaeis absoluta image
André Aptroot  
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image
Dibaeis absoluta image