Yarrumia coronata
Family
Lobariaceae
Flora category
Lichen – Native
Structural class
Lichens - Foliose
Current conservation status
2018 | Not Threatened | Qualifiers: SO
Brief description
Characterised by its large lobes, which are very faveolate (appearing reticulate and pitted), its yellow medulla, and numerous red-brown to blackish apothecia.
Distribution
North Island. South Island. Stewart Island. Snares Islands. Chatham Islands. Auckland Islands. Campbell Island. Antarctica. Throughout.
Habitat
Often locally common on twigs or bark in full sunlight or in moderate shade in humid habitats, lowland to subalpine, s.l. to 1500 m.
Detailed description
Thallus ± orbicular, attached centrally, margins ± free, 5-12(-30) cm diam. Lobes large, rounded, 1.5-5.0 cm wide, margins minutely indented-incised, not sorediate or isidiate. Upper surface bright lettuce-green or glaucous-green or pale yellowish-green when wet, pale greyish-green when dry, cinnamon-brown or suffused purplish on storage, matt to rather waxy, glossy and often tinged brown marginally, uneven, ± deeply faveolate-reticulate, especially towards margins. Medulla yellow. Photobiont green. Lower surface complexly wrinkledverrucose, not or sparingly tomentose, pale yellowish or buff, blackish centrally. Pseudocyphellae yellow to reddish-yellow, to 0.6 mm diam., round to irregular, crowded, papillate, ± bursting at apices. Apothecia small 1-2 mm diam., abundant, contiguous or scattered, often crowded, disc matt, red-brown to blackish, convex to plane, concave when young, margins thin, crenate or denticulate-coronate, irregular, not isidiate, thalline exciple smooth, glossy. Ascospores fusiform, 1-3-septate, colourless, 25-36 × 7-11 µm.
Chemistry: Pulvinic dilactone, pulvinic acid, calycin, polyporic acid, and unidentified pigment (red in acetone) 2α,3β,22α-triacetoxystictane, 22α,hydroxystictane-3-one (±), 2α3β-diacetoxystictane-22α-ol, stictane-3β,22α-diol (±), 2αacetoxystictane-3β,22αdiol, 3β-acetoxystictane-2α,22α-diol (±) and stictane-2α,3β,22α-triol (±).
Similar taxa
Distinguished from Yarrumia colensoi (to which it seems most closely related) by the broader, rounder lobes which do not have laciniate incised margins, by the characteristically faveolate upper surface, the smaller apothecia with red-brown or black discs with smooth, crenulate but not eroded-isidiate margins, and a distinctive reddishpurple acetone extract. The smooth, glossy thalline exciple distinguishes it from Podostictina degelii and Podostictina pickeringii both related species which have also a different morphology and chemistry.
Substrate
Corticolous (bark)
Attribution
Fact sheet prepared by Melissa Hutchison (2 February 2022). Brief description, Distribution, Habitat, Features and Similar taxa sections copied from Galloway (1985, 2007).
References and further reading
Galloway D.J. 1985: Flora of New Zealand: Lichens. Wellington: PD Hasselberg, Government Printer. 662 pp.
Galloway D.J. 2007: Flora of New Zealand: Lichens, including lichen-forming and lichenicolous fungi. 2nd edition. Lincoln, Manaaki Whenua Press. 2261 pp.