(Nagah., Hamam. & Nakase) F.Y. Bai & Q.M. Wang, FEMS Yeast Research 8 (5): 805 (2008)


Tremellomycetes, Subclass Tremellomycetidae





Synonymy: ≡ Cryptococcus surugaensis Nagah., Hamam. & Nakase, International Journal of Systematic and Evolutionary Microbiology 53 (6): 2097 (2003)

Hannaella F.Y. Bai & Q.M. Wang, FEMS Yeast Research 8(5): 805 (2008)

Type species: Hannaella sinensis (M.X. Li) F.Y. Bai & Q.M. Wang, FEMS Yeast Research 8 (5): 805 (2008)

Marine species:

Hannaella surugaensis (Nagah., Hamam. & Nakase) F.Y. Bai & Q.M. Wang, FEMS Yeast Research 8 (5): 805 (2008)

≡ Cryptococcus surugaensis Nagah., Hamam. & Nakase, International Journal of Systematic and Evolutionary Microbiology 53 (6): 2097 (2003)

Generic description:

Budding cells are oval, ellipsoidal or subglobose. Ballistoconidia may or may not be formed. If formed, they are rotationally symmetric, flabelliform, turbinate, globose or subglobese. Colonies are cream to yellowish, mucoid, smooth and shiny. Hyphae or pseudohyphae may be present. Clamp connections are absent. Fermentation is absent. Diazonium blue B and urease reactions are positive. The major ubiquinone is Q-10.

Species description:

In YM broth (Difco) after 3 days’ culture at 25 °C, cells are ovoidal to ellipsoidal (2–4 x 2–7 μm) and occur singly or in parent-bud pairs. A sediment and fragile pellicle are formed after 1 month. After 1 month on YM agar at 25 °C, streak culture is light yellow, glistening, soft and has an entire margin. In Dalmau plate cultures on cornmeal agar (Difco), no branching hyphae or pseudohyphae are formed. Fermentation ability is negative. The following carbon compounds are assimilated: D-glucose, galactose, L-sorbose, sucrose, maltose, cellobiose, trehalose, melibiose, raffinose, melezitose, D-xylose, L-arabinose, D-arabinose, D-ribose, L-rhamnose, glycerol, erythritol, ribitol (weak), galactitol, D-mannitol, D-glucitol (weak), methyl a-D-glucoside, salicin (weak), glucono-d-lactone, 2-ketogluconic acid, 5- ketogluconic acid, DL-lactic acid, succinic acid, citric acid and inositol; no growth occurs on lactose, inulin, soluble starch, ethanol, D-glucuronic acid or D-galacturonic acid. The nitrogen compounds ethylamine, lysine and cadaverine are assimilated. No growth occurs on potassium nitrate or sodium nitrite. Maximum temperature for growth is 31–34 °C. Vitamins are not required for growth. No growth occurs on 50% glucose/yeast extract agar. Growth occurs in the presence of 100 p.p.m. cycloheximide. Growth in the presence of 10% sodium chloride is negative. Starch-like substances are produced. Diazonium blue B reaction is positive. Urease activity is positive. G+C content of nuclear DNA is 48?3 mol% (by HPLC). Major ubiquinone is Q-10.


Key references:

Jones EBG, Suetrong S, Sakayaroj J, Bahkali AH, Abdel-Wahab MA, Boekhout T, Pang KL (2015) Classification of marine Ascomycota, Basidiomycota, Blastocladiomycota and Chytridiomycota. Fungal Diversity 73: 1-72.

Nagahama T, Hamamoto M, Nakase T, Takaki Y, Horikoshi K (2003) Cryptococcus surugaensis sp. nov., a novel yeast species from sediment collected on the deep-sea floor of Suruga Bay. International Journal of Systematic and Evolutionary Microbiology. 53(6):2095-2098

Wang, Q.M.; Bai, F.Y. (2008) Molecular phylogeny of basidiomycetous yeasts in the Cryptococcus luteolus lineage (Tremellales) based on nuclear rRNA and mitochondrial cytochrome b gene sequence analyses: proposal of Derxomyces gen. nov. and Hannaella gen. nov., and description of eight. FEMS Yeast Research. 8(5):799-814

Type & Location:
Other Specimens:
isolated from sediments collected from the deep-sea floor.
Pertinent Literature:
NOTES: Nagahama et al. (2003) referred the new species isolated from deep sea sediments to the genus Cryptococcus based on morphological, chemical and phylogenetic data. Later, two new genera, Derxomyces (type species: Derxomyces mrakii) and Hannaella (type species: Hannaella sinensi) were proposed to accommodate the species in the Bullera mrakii and B. sinensis clades, respectively, based mainly on D1/D2 and ITS sequence comparison. Currently 12 species are included in Hannaella, with H. surugaensis the only species recovered from marine habitats, namely deep sea sediments (Jones et al. 2015).


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