Galapagos Species Database
The Galapagos Species Database shares the information about the species from our Natural History Collections.
Leptogium milligranum
liquen de piel gelatinosa, Jellyskin lichen, vinyl lichen
Thallus black to brownish black when dry, deep olive or brownish black when wet, ± adnate, thick, swelling considerably when wet; outline orbicular; lobes indistinct and broadly merging; surface wrinkled, dull, longitudinally folded and thus strongly ridged; isidia numerous, granular, rarely ± subcylindrical; usually abundant all across thallus, especially on the thallus ridges, occasionally also marginal; apothecia not seen in Galapagos specimens.
At first glance this species looks more like a Collema, but it cannot be easily confused with the three other Collema species currently known from Galapagos. Reports by Weber (1986) of L. isidiosellum are erroneous; all Galapagos material previously identified as Leptogium isidiosellum (Riddle) Sierk has fusing lobes and coarsely granular isidia and thus belongs to L. milligranum. The species is often incorrectly reported as L. millegranum, the correct spelling being milligranum.
Domain
Eukaryota
Kingdom
Fungi
Phylum
Ascomycota
Class
Lecanoromycetes
Order
Peltigerales
Family
Collemataceae
Genus
Leptogium
Species
milligranum
Taxon category: Accepted
In Weber (1986) and Elix & McCarthy (1998) cited as L. millegranum
Origin: Native
Map of specimen collection localities or observation records for this species in our collections database.
Distribution: On bark or wood, rarely also on rock (basalt lava), moderately common from the transition zone to the lower humid zone, rarely also at higher elevations.
- Bungartz, F. (2008) Cyanolichens of the Galapagos Islands - The genera Collema and Leptogium. Sauteria 15: 139-158.
- Elix, J.A. McCarthy, P.M. (1998) Catalogue of the Lichens of the Smaller Pacific Islands. Bibliotheca Lichenologica 70, J. Cramer, Berlin, Stuttgart, 361pp.
- Weber, W.A. (1986) The Lichen Flora of the Galápagos Islands, Ecuador. Mycotaxon 27: 451-497.
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This page should be cited as follows:
"Galapagos Species Database, Leptogium milligranum", dataZone. Charles Darwin Foundation, https://datazone.darwinfoundation.org/en/checklist/?species=2955. Accessed 31 October 2026.