Asteridiella selaginellae

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Asteridiella selaginellae
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Sordariomycetes
Order: Meliolales
Family: Meliolaceae
Genus: Asteridiella
Species:
A. selaginellae
Binomial name
Asteridiella selaginellae

Asteridiella selaginellae is a species of fungus in the family Meliolaceae, first described by Marie Leonore Farr in 1968. [1] [2] It has been found in Mexico on the leaves of Selaginella pilifera (the resurrection plant). [3]

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"Asterula, Sacc, has continuous hyaline spores (Hyalosporae), Asteronia, Sacc, has continuous brown spores (Phaeosporae). Asterina, Lev., has two-celled hyaline spores (Hyalodidymae). Asterella, Sacc, has two-celled brown spores (Phaeodidymae). Asteridium, Sacc, has multi-septate hyaline spores (Hyalophragmiae). And in the case of the specimen on Solanum viride with multi-septate brown spores, I have ventured to use Asteridiella (Phaeophragmiae)".

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On upper and under surfaces of leaves, leaf-stalks and branches; forming densely crowded, minute, black, generally orbicular, often confluent, easily detachable, brittle crusts, with surface of leaf beneath of a pale brown or pale reddish colour. Mycelium composed of an interosculating network of delicate, colourless, septate, luxuriantly branched hyphae, about 3 μ broad, and attached to matrix, gradually passing into the stouter coloured hyphae above it. Coloured hyphae dark brown, rigid, thick-walled, closely interwoven, septate, branched, 8-9½ μ broad, ultimate branchlets generally 1-septate, knobbed and paler in colour. Perithecia seated on crust in clusters, depressedly globose, black, rough with warty spines, 130-330 μ, the latter being the average full-grown size. Asci oblong to cylindrical, 4-spored usually, 38-64 X 13-26 μ (immature). Sporidia brown, oblong, 4-septate, slightly constricted at septa, rounded at both ends, 36-44 x 14-15 μ. Pycnidia globose, golden-brown, opening by circular mouth and wall composed of small polygonal cells 100-140 μ, along with perithecia. Sporules minute, subglobose or oval, hyaline or rarely brownish, 5½ x 3 μ or 4 μ diameter borne, on delicate hyaline, septate, branched hyphae.

On Solanum viride, R.Br.; Tintenbar, N.S.W. (Maiden).
The crusted mycelium is readily removed, and is steel-grey on the attached surface.

The asci when ripe seem to burst within the perithecium, hence the difficulty of getting a mature ascus. The sporidia, which are at first colourless, then greenish and finally brown, often germinate even within the perithecium either from one or more segments. They are stained greenish-yellow by potassium-iodide-iodine, and the other contents of the perithecia are similarly stained.

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References

  1. "Asteridiella selaginellae M.L.Farr, 1968". www.gbif.org. Retrieved 19 January 2022.
  2. Farr, M.L.; Horner, H.T. (1968). "Fungi on Selaginella" (PDF). Nova Hedwigia. 15: 239-283 [242]. ISSN   0029-5035. Wikidata   Q110620232.
  3. "Index Fungorum - Names Record: Asteridiella selaginellae". www.indexfungorum.org. Retrieved 19 January 2022.