Dermatocarpon intestiniforme (Körb.) Hasse

Bryologist, 15: 46, 1912. Basionym: Endocarpon intestiniforme Körb. - Parerga Lichenol.: 42, 1859.
Synonyms: Dermatocarpon aquaticum var. decipiens (A. Massal.) Zahlbr. non auct.; Dermatocarpon decipiens (A. Massal.) Dalla Torre & Sarnth. non auct.; Dermatocarpon fluviatile var. decipiens (A. Massal.) Vain. non auct.; Dermatocarpon luridum var. decipiens (A. Massal.) H. Riedl non auct.; Dermatocarpon polyphyllum Dalla Torre & Sarnth.; Dermatocarpon weberi var. decipiens (A. Massal.) Lambinon non auct.; Endocarpon decipiens A. Massal. non auct.; Endocarpon miniatum var. decipiens A. Massal. non auct.
Distribution: N - Frl, Ven (Nascimbene & Caniglia 2000, 2003c), TAA, Lomb (Gheza 2019), Piem (Morisi & Sereno 1995, Isocrono & al. 2003, Morisi 2005), VA (Piervittori & Isocrono 1997, 1999). C - Tosc (TSB 36835), Umb (Ravera & Di Toma 2003, Ravera & al. 2006), Mol (Ravera & Genovesi 2012, Genovesi & Ravera 2014). S - Cal (Puntillo 1996).
Description: Thallus foliose to subcrustose, not umbilicate, multi-lobed, the lobes interconnected, with numerous holdfasts scattered over the lower surface, (3-) 5-15 mm wide, the central ones markedly sinuous, with down-turned margins. Upper surface grey-brown, usually pruinose; lower surface brown to dark brown, smooth to rugose. Upper cortex (40-)50-90(-110) μm thick, brown in the uppermost part, with an epinecral layer of air-filled hyphae; lower cortex paraplectenchymatous; medulla white, of filamentous hyphae, I-. Perithecia common, slightly oblong, immersed in the thallus and scattered over almost the whole upper surface (appearing as black dots), without involucrellum. Exciple colourless except in the brown uppermost part; hamathecium or periphyses and periphysoids, interascal filaments absent; hymenial gel hemiamyloid. Asci 8-spored, clavate, fissitunicate, the wall thickened above, not amyloid. Ascospores 1-celled, hyaline, broadly ellipsoid to subglobose, 9-15 x 7-9 µm. Pycnidia common, black, immersed. Conidia bacilliform. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mainly boreal-montane to arctic-alpine, circumpolar lichen found on more or less calciferous rocks in periodically wet places, or near the ground, mostly in upland areas. According to Heidmarsson (2017), however, this is just a morph of D. miniatum. As the molecular taxonomy of the D. miniatum-complex is not fully resolved, I prefer to provisionally maintain the taxon as distinct.
Growth form: Foliose, narrow lobed
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)

Commonnes-rarity: (info)

Alpine belt: rare
Subalpine belt: rather 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

Curtis Randall Björk – CC BY-SA 4.0
Potlatch River Canyon, Latah County, Idaho Date: 2011-10-08 On river boulders at shoreline

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35223)

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (34181)

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35223)
lower face