Cladonia trassii Ahti

Folia Cryptog. Estonica, 32: 7, 1998.
Synonyms: Cladonia cerasphora auct.; Cladonia lepidota auct. non (Ach.) Nyl.; Cladonia stricta auct.
Distribution: N - Lomb (Rivellini & Valcuvia 1996, Ravera & al. 2023), Piem (Morisi & Sereno 1995). C - Tosc.
Description: Primary thallus squamulose, usually persistent, the squamules abundant, round to strap-shaped, 1-3 mm long, green or grey-green, often partially browned in upper part, melanotic at base. Podetia long and slender, hollow inside, 1-8 cm tall, 1-3 mm thick, unbranched or with 1-2 branches and closed axils, usually pointed at apex, rarely with narrow cups proliferating from the center, whitish or bluish grey, strongly melanotic and checkered at base, the cortex of more or less contiguous areoles on the upper third, but scattered over a black stereome over much of the stalk, giving it a spotted appearance; podetial squamules very common, evenly spaced and ear- or wing-like, rounded, sticking out almost at right angles. Apothecia infrequent, dark brown. Asci 8-spored, clavate, thickened at apex, with a K/I+ blue tholus and a K/I+ strongly blue outer gelatinous sheath, Cladonia-type. Ascospores 1-celled, hyaline, ellipsoid. Pycnidia common, terminal on tips of podetia, ovoid to subglobose, constricted at base, with a colourless jelly. Conidia hyaline, curved. Spot tests: K+ yellow, C-, KC-, P+ red, UV-. Chemistry: atranorin and fumarprotocetraric acid complex.
Note: on acid soil near or above treeline; all Italian records of this species are under C. stricta or C. lepidota. C. stricta is an arctic species, and according to Ahti (in litt.) Italian records most likely refer to C. trassii (see Ahti 1998).
Growth form: Fruticose

Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

Mark Rahill - CC BY-SA 4.0

Mark Rahill - CC BY-SA 4.0

Einar Timdal - Source: - CC BY-NC