Tomasellia gelatinosa (Chevall.) Zahlbr.

Cat. Lich. Univ., 1: 474, 1922. Basionym: Arthonia gelatinosa Chevall. - J. Phys. Chem. Hist. Nat., 94: 54, 1822.
Synonyms: Athrismidium gelatinosum (Chevall.) Trevis.; Melanotheca gelatinosa (Chevall.) Zahlbr.; Melanotheca leightonii (A. Massal.) Kremp.; Tomasellia leightonii A. Massal.
Distribution: N - Ven, Lig. C - Umb (Ravera 1999, Ravera & al. 2006), Laz (Ravera 2006, Munzi & al. 2007), Mol (Caporale & al. 2008). S - Cal (Puntillo 1996).
Description: Thallus crustose, not lichenized, mostly endosubstratic and poorly evident, brownish or reddish brown, sometimes delimited by a dark line. Ascocarps perithecioid, aggregated in circular to ellipsoid pseudostromata with an overlying black wall which is not continuous below the hamathecium. Hamathecium of branched, not anastomosing, non-amyloid pseudoparaphyses. Asci 8-spored, obclavate, tapering to apex, fissitunicate, with two functional wall layers, K/I-. Ascospores 1-3-septate with eusepta, hyaline or finally pale brown, clavate to ellipsoid, 18-27 x 7-10 µm, the wall not ornamented. Photobiont absent. Spot tests: all negative. Chemistry: without lichen substances.
Note: a mainly temperate, pioneer, non-lichenized fungus growing on the smooth bark of deciduous trees (e.g. Alnus, Corylus, Sorbus, Tilia, etc.).
Growth form: Fungus
Substrata: bark
Reproductive strategy: mainly sexual
Pioneer species

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: rare
Humid mediterranean belt: very rare
Dry mediterranean belt: absent

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

Manuel Gil
Spain, Canary Islands, Lanzarote, on Nicotiana glauca

Manuel Gil
Spain, Canary Islands, Lanzarote, on Nicotiana glauca - Licence: CC BY-NC 3. Photo uploaded by Mark Powell