Coniochaeta tetraspora
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| Coniochaeta tetraspora | |
|---|---|
Scientific classification  | |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Sordariomycetes |
| Order: | Coniochaetales |
| Family: | Coniochaetaceae |
| Genus: | Coniochaeta |
| Species: | C. tetraspora |
| Binomial name | |
| Coniochaeta tetraspora Cain (1961) | |
Coniochaeta tetraspora is a species of fungus in the family Coniochaetaceae.[1][2] It was first isolated from forest soil in Queensland, Australia, and has since been recorded from the Galápagos Islands, Spain, and California. The species exhibits a distinctive pattern of ascospore development: eight spores initially form within each spore sac, but four consistently abort, leaving only four to mature. In culture, colonies are thin and whitish, later becoming pinkish as asexual spores accumulate, and the dark, pear-shaped fruiting bodies bear short spiny hairs. The fungus is self-fertile, meaning a single spore can give rise to a colony capable of completing its sexual cycle without a mating partner.
Coniochaeta tetraspora is an ascomycete fungus that was described as a new species by Roy F. Cain in 1961, based on material isolated in pure culture from forest soil collected at Binna Burra, Queensland, Australia, by Jack Warcup (type specimen TRTC 36859). In Cain's account, the species was characterised by a combination of dark, spiny hairs on the perithecia and an asexual (conidial) stage producing both phialospores and blastospores, features consistent with placement in Coniochaeta.[2]
Cain separated C. tetraspora from superficially similar dark-spored ascomycetes (including species then placed in Sordaria) by its short, rigid, spiny perithecial hairs, the very short stipe of the ascus, and its relatively small ascospores that are laterally compressed (flattened on the sides) and bear a germinal slit running the full length of the spore. He also reported an unusual developmental pattern in the ascus: eight ascospores are delimited at a very early stage, but four soon abort, leaving four spores to mature (reflected in the four-spored asci seen at maturity).[2]
A later cytogenetic study confirmed that the four-spored condition in Coniochaeta tetraspora results from the degeneration of four ascospores after an initially normal eight-spored stage, rather than from four spores being formed directly. The authors also found the species to be homothallic: cultures started from single uninucleate conidia or single ascospores were self-fertile and repeatedly produced asci in which four spores mature and four abort.[3]