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Pannaria phyllidiata Elvebakk
Nomenclature
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Family: PannariaceaeGenus: Pannaria
SUMMARY
Mycobank MB 517803
Thallus foliose, corticolous, forming rosettes 3–15 cm in diam., closely attached to the substrate, unless growing over bryophytes or other uneven substrates. Lobes irregularly to subdichotomously branched, discrete in peripheral parts, imbricate to centrally coalescent, 0.7–1.2 mm wide and up to 10 mm long, flattened to weakly concave, margins entire, narrowly swollen, 120–200 µm thick. Upper surface pale greyish green when fresh and dry, salad green when fresh and moist, turning gradually chestnut brown after storage in herbaria, glabrous and glossy. Epicortex 30–50 µm thick, upper third developing brown pigmentation after storage and almost sclerenchymatic near the surface, below paraplectenchymatic with luminae globose to irregularly ellipsoid, 8–15 µm long, walls 1.5–3 µm thick. Photobiont layer 20–25 µm thick, of globose to subglobose cf. Myrmecia cells, 5–15 µm in diam. Medulla 50–100 µm thick, white, dark brown in lower part. Lower cortex lacking; rhizines common, brown and simple to sparingly branched; hypothallus felted, brown, and sometimes forming a blackish prothallus, particularly when growing on smooth bark. Cephalodia common, laminal on the upper surface, globose to subglobose when young, later becoming irregularly pulvinate, and finally placodioid-nodulose and up to 2 mm in size, occasionally also developed on the hypothallus and the lower side; epicortex as in the chlorobiont, but luminae 5–10 µm in size; cyanobiont Nostoc, cells greyish green, subglobose to irregularly ellipsoid, 3–4.5 x 4–7 µm in size, organized within indistinct spherical glomeruli, ca. 20 µm in size, and without visible chain structures. Apothecia scattered, laminal, substipitate, 0.7–2.5 mm broad, discs rufous brown, flat,; thalline excipulum crenate-striate, with phyllidia; epithecium light brown, 15–25 µm thick, hymenium colourless, but strongly IKI+ blue, ca. 100 µm thick; hypothecium light brown, ca. 80 µm thick, IKI negative; paraphyses simple to weakly branched, septate, with slightly swollen apices; asci clavate, 15 x 70–90 µm in size, no internal IKI+ amyloid structures observed, with eight ascospores. Proper ascospores hyaline, non-septate, ellipsoid to weakly citriform, 7.5–10 x 12–16 µm in size; perispores ellipsoid to weakly citriform, 8–11 x 14–19 µm in size, distinctly verrucose when mature. Secondary chemistry: vicanicin (major) and unidentified terpenoids (trace).