Carbonea agellata (Darb.) Fryday
Lichenologist 44: 490. 2012

Basionym: Lecidea agellata Darb., Wiss. Ergebn. Schweisch. Südpolarexpidit. 1901-1903. 4: 4 (1912).


Description:
Thallus: creamy-brown, areolate; individual thalli 1-2 cm across but forming mosaics separated by a black hypothallus.
Apothecia: small, blue-black, 0.3-0.4 mm diam, initially immersed in the thallus, becoming sessile when mature.
Epihymenium: dilute brown with an olivaceous tinge.
Thecium: c. 60 µm thick. Paraphyses ±simple, lax in K, not capitate.
Hypothecium: pale straw.
Asci: Lecanora-type.
Ascospores: simple, hyaline, broad ellipsoid, 12-14 x 6-8 µm.

Chemistry:

Distribution:
Reported only from the Falkland Islands.

Notes:
In 1992 Hertel annotated a specimen of Lecidea agellata in S (sub Pertusaria alterimosa) “The type specimen of Lecidea agellata Darb. could not be traced yet. According to the protologue of L. agellata this taxon is characterised by e.g.: ”apothecia immersa, thallus K-, margine nigro diviscus “ - characters which do not fit with those of this collection.” He later, 1994, annotated this specimen as Carbonea subdeclinans (Müll. Arg.) Hertel, but does not appear to have published this combination. The type collection of L. agellata has since been found and agrees well with the published description but has a KC+ orange thallus. The rich material in MSC shows a complete range from immersed apothecia to sessile but there are significant anatomical differences between the two type specimens (narrower ascospores, aeruginose epihymenium, orange-brown hypothecium) that suggest that they are not con-specific.

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Additional images of the type collection are available here


Thallus


Apothecia


Thecium


Ascus