Ramboldia petraeoides
Ramboldia petraeoides (Nyl. ex Bab. & Mitt.) Kantvilas & Elix
Bryologist 97: 298. 1994
Basionym: Lecidea petraeoides Nyl. ex. C.Bab. & Mitt. in J.D. Hooker Fl. Tasm. 2: 352. (1859).
Synonyms: Protoparmelia petraeoides (Nyl. ex C.Bab. & Mitt.) Hertel, Beih. Nova Hedwigia 79: 452 (1984). —Pyrrhospora petraeoides (Nyl. ex C.Bab. & Mitt.) Hafellner, Herzogia 9: 733 (1993).
Lecidea subtenebrosa Nyl., Flora 50: 439 (1867).
Lecidea myoplaca Zahlbr., Denkschr. Akad. Wiss. Wien math.-naturwiss. Kl. 104: 311 (1941). —Psora myoplaca (Zahlbr.) C.W.Dodge, Nova Hedwigia 19: 490 (1971) ["1970"].
Description:
Thallus obscure grey or fawnish often somewhat reddish-brown, wrinkled-plicate to ± bullate or inflated-subsquamulose, or subareolate-granular, ± diffract, 1-4 cm diam.
Apothecia sessile or innate, black or reddish-black, often red-brown at margins, matt, epruinose, 0.2-2.0 mm diam., solitary or confluent, often crowded, disc plane to subconvex, surface often furrowed, margins thin, brown, or lacking. Epithecium red-brown, 8-14 µm thick. Hymenium pale yellow-brown, 50-65 µm tall. Paraphyses thick, dense, red-brown and capitate, to 5 µm thick at apices. Hypothecium colourless. Ascospores ellipsoid, 8-10 × 4-5 µm.
Chemistry : C–, K+ red, Pd–. Norstictic acid detected by TLC.
Distribution:
Australasia and southern South America (Falkland Islands and Isla de los Estados).
Notes:
Only the form with innate, concave apothecia (var. concava (Müll. Arg.) Fryday) is known from South America where it is quite frequent. However, Kantvilas & Elix (2007 - Lichenologist 38: 135-141) considered this form to be within the variation of the species and did not afford it any taxonomic rank.