Biology:Scytinium tetrasporum
| Scytinium tetrasporum | |
|---|---|
Scientific classification 
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| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Peltigerales |
| Family: | Collemataceae |
| Genus: | Scytinium |
| Species: | S. tetrasporum
|
| Binomial name | |
| Scytinium tetrasporum (Th.Fr.) Otálora, P.M.Jørg. & Wedin (2014)
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| Synonyms[1] | |
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Scytinium tetrasporum is a species of lichen-forming fungus in the family Collemataceae.[2] Found in Europe, it was described as a new species in 1865.
Taxonomy
Leptogium tetrasporum was introduced as a new species in 1865 by the Swedish lichenlogist Theodor Magnus Fries. The type specimen is from Hälsingland, Sweden (Bjuråker parish, Stråsjö), based on material collected by J.A. Hartman. The species epithet refers to the unusual spore count: each ascus bears four ascospores rather than the eight typical of Leptogium. In the protologue the author compared it with Nylander's L. humosum (now Scytinium tenuissimum) but treated it as distinct on several points, including a strongly cellular [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], a colourless [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], hyaline (colourless and translucent) paraphyses with tawny tips, somewhat cylindrical to slightly club-shaped asci, and a hymenial gel that stains deep blue in iodine.[3]
Mónica Otálora, Per Magnus Jørgensen, and Mats Wedin reclassified the species in genus Scytinium in 2014.[4]
Description
The thallus is closely attached to the substrate ([[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]) and built of small, warty to lobulate granular patches ([[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]) that are dark brown to almost black. Apothecia (fruiting bodies) are rather small, the same colour as the thallus, and remain distinctly concave. The algal partner ([[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]) occurs in bead-like chains, and the tissue beneath the hymenium (the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]) is colourless. Sterile filaments interspersed between the spore sacs (paraphyses) are clear with tawny tips. Asci are somewhat cylindrical and inflated, producing four large, oblong ascospores that are [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]—divided by several transverse and longitudinal septa—with three more strongly marked cross-walls. The spores are constricted at the septa and blunt at both ends, measuring 22–34 × 10–16 μm. The hymenial gel stains an intense blue with iodine. Asexual propagules (conidia) are linear, straight or very slightly curved, about 3–4 μm long and roughly four times longer than wide.[3]
References
- ↑ "Scytinium tetrasporum (Th. Fr.) Otálora, P.M. Jørg. & Wedin, Fungal Diversity 64(1): 291 (2013) [2014"]. Species Fungorum. https://www.speciesfungorum.org/names/Synonymy.asp?RecordID=805751.
- ↑ "Scytinium tetrasporum (Th. Fr.) Otálora, P.M. Jørg. & Wedin". Species 2000: Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/4W6JJ.
- ↑ 3.0 3.1 Fries, T.M. (1865). "Bidrag till Skandinaviens Laf-flora.". Öfversigt af Kongl. Vetenskaps-Akademiens Förhandlingar 21: 269–277 [276]. https://www.biodiversitylibrary.org/page/32288846.
- ↑ Otálora, Mónica A.G.; Jørgensen, Per M.; Wedin, Mats (2014). "A revised generic classification of the jelly lichens, Collemataceae". Fungal Diversity 64 (1): 275–293. doi:10.1007/s13225-013-0266-1.
Wikidata ☰ {{{from}}} entry
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