Naematelia

Naematelia is a genus of fungi in the family Naemateliaceae. All Naematelia species are parasites of other fungi (Stereum species) and produce anamorphic yeast states. When produced, Basidiocarps (fruit bodies),, are gelatinous and are colloquially classed among the "jelly fungi."Four species of Naematelia are currently recognized worldwide. One species, Naematelia aurantialba, is commercially cultivated for food.

Naematelia
Gelatinous fruit body of Naematelia encephala with its host Stereum sanguinolentum
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Tremellomycetes
Order: Tremellales
Family: Naemateliaceae
Genus: Naematelia
Fr.
Type species
Naematelia encephala
Synonyms

Taxonomy

History

Naematelia was introduced in 1816 by Elias Magnus Fries for fungal fruit bodies with a gelatinous outer layer and a hard inner core, as in the type species Naematelia encephala. Some mycologists subsequently used the name, while others considered Naematelia synonymous with Tremella since its basidia were Tremella-like.[1] In a 1961 paper, American mycologist Robert Bandoni showed that the hard inner core of Naematelia encephala was composed largely of host tissue (Stereum sanguinolentum) and that Naematelia, therefore, represented no more than a Tremella species and its host.[1]

However, molecular research, based on cladistic analysis of DNA sequences, has shown that Tremella is polyphyletic (and hence artificial).[2][3][4][5]

Therefore, a different generic name was required for a group of species not closely related to Tremella mesenterica (the type species of Tremella), and in 2015 Naematelia was selected as the earliest such name available. Comparatively few species, however, has yet to be sequenced.[6]

Description

Fruit bodies are gelatinous (but may have a hard inner core mainly composed of host hyphae) and are variously cephaliform (like a brain, with folds and ridges), lobed, or foliose (with leaf-like or seaweed-like fronds). Colors are typically pinkish, ochraceous, yellow, or brown.

Microscopic characters

Naematelia species produce clamped hyphae and have haustorial cells from which hyphal filaments seek out and penetrate the hyphae of the host. The basidia are "tremelloid" (globose to ellipsoid, sometimes stalked, and vertically or diagonally septate), giving rise to long, sinuous sterigmata or epibasidia on which the basidiospores are produced. These spores are smooth, globose to ellipsoid, and germinate by hyphal tube or yeast cells. Conidiophores are often present, producing conidiospores that are similar to yeast cells.[2][7]

Habitat and distribution

Species are parasitic on fruit bodies of Stereum species that grow on dead attached or fallen wood. Hosts include Stereum hirsutum on broadleaf trees and Stereum sanguinolentum on conifers.

As a group, Naematelia species occur worldwide, though individual species may have a more restricted distribution.

Species and hosts
ImageNameDistributionHost
Naematelia aurantiaAsia, Australasia, Europe, North & South AmericaStereum hirsutum[8]
Naematelia aurantialbaChinaStereum hirsutum[9]
Naematelia encephalaAsia, Australasia, Europe, North AmericaStereum sanguinolentum[10]
Naematelia microsporaSouth AfricaStereum species

References
  1. Bandoni RJ. (1961). "The genus Naematelia". American Midland Naturalist. 66 (2): 319–328. doi:10.2307/2423032. JSTOR 2423032.
  2. Chen C-J. (1998). Morphological and molecular studies in the genus Tremella. Berlin: J. Cramer. p. 225. ISBN 978-3-443-59076-5.
  3. Fell JW, Boekhout T, Fonseca A, Scorzetti G, Statzell-Tallman A (2000). "Biodiversity and systematics of basidiomycetous yeasts as determined by large-subunit rDNA D1/D2 domain sequence analysis" (PDF). International Journal of Systematic and Evolutionary Microbiology. 50 (3): 1351–1371. doi:10.1099/00207713-50-3-1351. PMID 10843082. Retrieved 2010-04-21.
  4. Sampaio JP, Weiss M, Gadanho M, Bauer R (2002). "New taxa in the Tremellales: Bulleribasidium oberjochense gen. et sp. nov., Papiliotrema bandonii gen. et sp. nov. and Fibulobasidium murrhardtense sp. nov". Mycologia. 94 (5): 873–887. doi:10.2307/3761703. JSTOR 3761703. PMID 21156562.
  5. Findley K, Rodriguez-Carres M, Metin B, Kroiss J, Fonseca A, Vilgalys R, Heitman J (2009). "Phylogeny and Phenotypic Characterization of Pathogenic Cryptococcus Species and Closely Related Saprobic Taxa in the Tremellales" (PDF). Eukaryotic Cell. 8 (3): 353–361. doi:10.1128/EC.00373-08. PMC 2653247. PMID 19151324.
  6. Liu XZ, Wang QM, Göker M, Groenewald M, Kachalkin AV, Lumbsch HT, Millanes AM, Wedin M, Yurkov AM, Boekhout T, Bai FY (2015). "Towards an integrated phylogenetic classification of the Tremellomycetes". Studies in Mycology. 81: 85–147. doi:10.1016/j.simyco.2015.12.001. PMC 4777781. PMID 26955199. S2CID 21998745.
  7. Zugmaier W, Bauer R, Oberwinkler F (1994). "Mycoparasitism of some Tremella species". Mycologia. 86 (1): 49–56. doi:10.2307/3760718. JSTOR 3760718.
  8. Roberts P. (1995). "British Tremella species I: Tremella aurantia and T. mesenterica". Mycologist. 9 (3): 110–114. doi:10.1016/S0269-915X(09)80270-X.
  9. Bandoni RJ, Zang M (1990). "On an undescribed Tremella from China". Mycologia. 82 (2): 270–273. doi:10.2307/3759859. JSTOR 3759859.
  10. Roberts P. (1999). "British Tremella species II: T. encephala, T. steidleri & T. foliacea". Mycologist. 13 (3): 127–131. doi:10.1016/S0269-915X(99)80044-5.
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