Cladonia floerkeana (Fr.) Flörke

Comm. Clad.: 99, 1828. Basionym: Cenomyce floerkeana Fr. - Sched. Crit. Lich. Suec., 1-4: 18, 1825.
Synonyms: Cladonia berghsonii Asperges; Cladonia floerkeana var. chloroides (Flörke) Vain.; Cladonia macilenta subsp. floerkeana (Fr.) V. Wirth; Cladonia macilenta var. corticata Vain.
Distribution: N - Frl (TSB 832), TAA (Caniglia & al. 2002, Nascimbene & al. 2006e, 2007b, Lang 2009, Nimis & al. 2015), Lomb (Rivellini 1994, Rivellini & Valcuvia 1996, Nascimbene 2006, Gheza 2018, 2019, Gheza & al. 2022), Piem (Isocrono & al. 2004, 2006), VA (Matteucci & al. 2008, Isocrono & al. 2008). C - Tosc (Benesperi & al. 2007, Chiarucci & al. 2008), Sar (Burgaz & al. 2020).
Description: Primary thallus squamulose, persistent, the squamules ascending, scattered or forming small mats, small to middle-sized, up to 3 mm long, 1-2 mm wide, crenate or slightly lobed, olivaceous green to brownish green above, white beneath, sometimes with pale orange patches near the attachment point. Podetia brownish grey to greenish grey, subcylindrical to bacilliform, 1-10 mm tall (rarely more, up to 40 mm), 0.5-1 mm thick, simple or sparingly branched in upper part, corticate or rarely ecorticate in upper part, the cortex variable, from smooth and unbroken to areolate, sometimes squamulose or granulose, the granules simulating very coarse soredia. Apothecia frequent, scarlet red, terminal, often forming conspicuous clusters. 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 scarlet red, distinctly stalked, most common on the primary squamules, rarer on podetia, with a red jelly. Conidia cylindrical. Photobiont chlorococcoid. Spot tests: K- or rarely K+ yellow, C-, KC-, P- or rarely P+ yellow, UV- (rarely UV+ bluish). Chemistry: the most common chemotype has barbatic and didymic acids, a rarer chemotype with thamnolic and didimyc acid has been also reported from Northern Europe; rhodocladonic acid in apothecia and pycnidia.
Note: a circumboreal-montane species found on organic soil and peat, but also on sand, more rarely on lignum or at the base of trunks, with optimum in the subalpine belt of the Alps.
Growth form: Fruticose

Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: rare
Oromediterranean belt: extremely rare
Montane belt: extremely rare
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

Gabriele Gheza -
Italy, Lombardia, Bergamo, Vilminore di Scalve, 1530 m

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (33799)

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (33799)

Triin Aimla; Owner: University of Tartu
originally as Cladonia floerkeana

Gabriele Gheza, Tromello (PV); Owner: Gabriele Gheza, Tromello (PV)

Leif Stridvall
Courtesy: Anita Stridvall -Source:

Mark Rahill - CC BY-SA 4.0
TSB 41428

Leif Stridvall - Source:

Courtesy: Olivier et Danièle Gonnet - Source:
France, Session AFL 2001 - Haute-Savoie