Harpidium rutilans Körb.

Syst. Lich. Germ.: 157, 1855.
Synonyms: Zeora rutilans Flot. nom. nud.
Distribution: N - TAA. S - Si.
Description: Thallus crustose, episubstratic, dark reddish brown, areolate, the areoles contiguous, angular, 0.2-0.5 mm wide, the peripheral ones slightly elongate, forming small, subplacodioid, up to 1 cm wide rosettes, without a distinct pro- or hypothallus. In section the thallus is homoiomerous and pseudoparenchymatous throughout, often overlain by a thin epinecral layer, 130-140 mm thick, the hyphae with with more or less isodiametric, 5-8 mm wide cells. Apothecia pycnoascocarps (developing from pycnidia), lecanorine-aspicilioid, 0.1-0.3 mm across, at first punctiform, then with an expanded disc, immersed in the areoles (usually 1 per areole) with a dark reddish brown, sometimes marginally slightly pruinose disc, and a very thin, finally often excluded thalline margin. Proper exciple poorly developed; epithecium pale reddish brown, K/I+ blue; hymenium colourless, 40-50 mm high, K/I+ blue; paraphyses strongly moniliform, branched in upper part, the apical cells not swollen; hypothecium colourless, opaque, 40-45 mm thick. Asci 8-spored, subglobose, unitunicate-rostrate, the wall thick, with a collar like amyloid inner layer. Ascospores 1-celled, hyaline, narrowly ellipsoid, often curved and appearing falcate or allantoid, 8-9 x 3-4 μm. Photobiont chlorococcoid. Spot tests: Thallus K-, C-, KC-, P-, UV-, I+ reddish. Chemistry: without lichen substances.
Note: on steeply inclined surfaces of siliceous rocks with periodical water seepage after rain, both in the Mediterranean Region and in dry-warm Alpine valleys; perhaps overlooked, but certainly not common.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis CC BY-SA 4.0
TSB 16615

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (16615)

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (16615)