Cenozosia excorticata
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Ordo: Lecanorales
Familia: Ramalinaceae
Genus: Cenozosia
Name
Cenozosia excorticata Jung & Werner sp. nov. – Wikispecies link – Pensoft Profile
Type
Chile. Atacama Desert, Pan de Azúcar National Park (25°59'03"S, 70°36'55"W; 764 m a.s.l.) specimen HBG-025792 (Herbarium Hamburgense, Hamburg, Germany).
Diagnosis
Recognized by its perforated, leprose thallus.
Etymology
The epithet ‘excorticata’ refers to the chondroid, perforated cortex which is loosely wrapped around a whitish medulla that penetrates the cortex during new growth.
Description
Thallus white to gray-brown with a leprose appearance, forming nest-like structures around 5 cm across but also large examples of more than 12 cm have been observed. Thallus divided into many long branches, up to 9 cm long, 0.3 mm thick, narrow cylindrical-teretiform but terminally kinked with a pale brown to blackened base. Mostly made of primary, fastigiate branches, sometimes dichotomously divided, especially towards the tips. Cortex made of pale, gray, hyaline, coalesced hyphae, forming a strongly perforated and wide sleeve around the white medulla pillowed by a few hyphal strands that crisscross between medulla and cortex sleeve. Medulla white, forming a loose, irregular strand made of crisscrossing hyphae within the cortex sleeve. During new growth the whitish medulla strand penetrates the cortex. Juvenile medulla strands without cortex sleeve are terminally light brown. Apothecia, round, bowl-shaped, gray with a concave, pink disc, mostly emerging lateral, sometimes terminal, up to 0.5 cm in diameter. Spores two celled, divided by a septum. Trebouxioid photobiont arranged in infrequent nests throughout the loose medulla and cortex network.
Secondary metabolites
Decarboxynorstenosporic acid, decarboxydivaricatic acid, zeorin. UV-, K-, C+ red, central strand only, KC+ yellow, central strand only, P-.
Distribution and ecology
Epiphytically directly on cacti stems or needles, preferably on Eulychnia sp., in the fog zones together with C. cava and various Ramalina species.
Notes
Similar to various Niebla species but endemic to the Atacama Desert forming the distinct Cenozosia cluster.
Original Description
- Jung, P; Werner, L; Briegel-Williams, L; Emrich, D; Lakatos, M; 2023: Roccellinastrum, Cenozosia and Heterodermia: Ecology and phylogeny of fog lichens and their photobionts from the coastal Atacama Desert MycoKeys, 98: 317-348. doi
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