Parmotrema subtinctorium
Synonyms
Canomaculina subtinctoria, Parmelia subtinctoria, Rimeliella subtinctoria
Family
Parmeliaceae
Flora category
Lichen – Native
Endemic taxon
No
Endemic genus
No
Endemic family
No
Structural class
Lichens - Foliose
Current conservation status
2018 | At Risk – Naturally Uncommon | Qualifiers: DP, SO, Sp
Brief description
Characterised by the grey-green, spreading thallus which is white-maculate (×10 lens); the simple or branched isidia; and the presence of salazinic acid and norlobaridone in the medulla.
Distribution
North Island: Northland (including Three Kings Is), South Auckland (Kaimanawa Ra., Waipakihi Valley), Hawke’s Bay (Wairoa), Taranaki (New Plymouth).
Pantropical. Known also from Europe, North America, Asia, and Australia .
Habitat
Rather rarely collected, mainly from coastal rocks and trees in northern localities.
Detailed description
Thallus orbicular to spreading, loosely attached, 5-15 cm diam., corticolous or saxicolous. Lobes rounded, 10-15 mm wide, margins crenate, sinuous, sparsely ciliate, cilia 1-1.5 mm long. Upper surface pale greenish-yellow to greyish, shining, distinctly white-maculate (×10 lens) becoming irregularly cracked with age, moderately to densely isidiate. Isidia small, terete, simple to branched, to 1 mm tall, rarely ciliate. Lower surface pale brown, rarely darkening centrally, with a wide, pale brown, papillate, naked marginal zone. Rhizines black, simple, frequent, central. Apothecia not seen.
Chemistry: Cortex K+ yellow; medulla K+ yellow→dark-red, C−, KC+ pink, Pd+ orange; containing atranorin, chloroatranorin, norlobaridone, salazinic acid and ±usnic acid (tr.).
Substrate
Corticolous, saxicolous
Attribution
Fact sheet prepared by Marley Ford (5 August 2021). 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.