Roccellinastrum spongoideum
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Jung2023MycoKeys98, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Jung2023MycoKeys98">{{Citation See also the citation download page at the journal. |
Ordo: Lecanorales
Familia: Byssolomataceae
Genus: Roccellinastrum
Name
Roccellinastrum spongoideum (Follmann) – Wikispecies link – Pensoft Profile
Description
Thallus usually 2 cm large but specimens up to 7 cm were observed, gray to brownish gray, sub- fruticose, byssoid-spongiose or cottony-granular. Lobes tubular, up to 20 mm long or longer, cylindrical and up to 5 mm broad or flattened and up to 6 mm broad, partly fenestrate in older parts. Young thalli at first as erect tufts developing to hollow tubes covered with white to light pink or brownish apothecia which are laminal, up to 0.5 mm broad, frequently compound, sessile or shortly stipitate. Hymenium 35–45 µm high, paraphyses branched, hypothecium colorless. Asci 26–35 × 8–10 µm, spores 1-septate at maturity, 7.5–10 × 1.5–3 µm. Excipulum of (often dichotomously) branched, radiating hyphae with strongly gelatinized walls, colorless, not sharply delimited from the paraphyses. Single hyphae often form loop structures in inner thallus parts. Thallus hyphae 3–9 µm wide, lumina ca. 1 µm thick. Cell lumina elongated or short, the ends sometimes characteristically enlarged adjacent to septa. Cells of the Symbiochloris photobionts (= ‘micareoid’) of 8–10 µm in diameter, arranged in nests of several cells.
Secondary metabolites
Atranorin, protocetraric acid and traces of two unknown constituents. UV-, K-, C-, KC+ orange, P+ yellow to orange.
Distribution and ecology
The endemic species grows epiphytically on downwards pointing needles mainly of the cactus Eulychnia sp. along the Coastal Range of the Atacama Desert of Chile where fog frequently occurs.
Notes
The pale brownish tinge of the apothecia is caused by crystals of pigments deposited on the outer surface of the fruiting bodies. It seems that Follmann (1967)[1] misinterpreted these crystals when he described a dark hypothecium and excipulum; in sections of the apothecium, hypothecium and excipulum are, in fact, colorless. R. spongoideum is easily distinguished from the other species by the well-developed grayish thallus composed of rather compact, tubular lobes, by the one-septate spores, and by its restricted habitat on cacti in fog zones along the coast of northern Chile.
Specimens examined
specimen HBG-025791 (Herbarium Hamburgense, Hamburg, Germany) from Chile, Atacama Desert, Pan de Azúcar National Park.
Taxon Treatment
- 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
Images
|
Other References
- ↑ Follmann G (1967) Die Flechtenflora der nordchilenischen Nebeloase Cerro Moreno. - Nov. Hedw. 14: 215–281 [Taf. 82-97].
