Halotthia

Fungalpedia – Note 2319, Halotthia

 

Halotthia. Kohlm.

Citation when using this data: Hongsanan S et al. 2020 – Fungalpedia, Ascomycota.

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1

Classification: Halotthiaceae, Pleosporales, Pleosporomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi

 

Notes – Halotthia typified by H. posidoniae was initially described as Sphaeria posidoniae. It was transferred to Pleosporaceae by Kohlmeyer & Kohlmeyer (1979). Malloch & Cain (1972) referred the genus to Zopfiaceae, and Jones et al. (2009a) placed it in the Pleosporales incertae sedis. Based on multi-gene analysis with LSU, rpb-2, SSU and tef1, Suetrong et al. (2009) showed it groups with Pontoporeia biturbinata in the Pleosporales, both genera commonly found on Posidonia oceanica and Cymodocea nodosa from the Mediterranean coast and Cyprus (Suetrong et al. 2009). Suetrong et al. (2009) did not assign it to any order and family until Zhang et al. (2013c) introduced Halotthiaceae with Halotthia posidoniae as the type genus.

 

Type species: Halotthia posidoniae (Durieu & Monta.) Kohlm., Nova Hedwigia 6: 9 (1963)

≡ Sphaeria posidoniae Dur. & Mont., Expl. Sci. Alg., Fl. Algér. 1(livr. 13): 502 (1848) [1846-49].

Other accepted species: Species Fungorum – search Halotthia.

 

 

Figure 1 – Halotthia posidoniae (NY 01389657, holotype). a Specimen and description. b Close up of ascomata. c Section through ascomata. d Hamathecium. e–f Asci when immature. g Ocular chamber. h Ascospores when immature. i–k Ascospores. Scale bars: c= 100 μm, e, f = 50 μm, d, g–k = 20 μm.

 

References

Jones EBG, Sakayaroj J, Suetrong S, Somrithipol S, Pang KL. 2009a – Classification of marine origin and evolution of fundamental reproductive and ecological traits. Systematic Biology 58, 224–239.

Kohlmeyer J, Kohlmeyer E. 1979 – Marine Mycology: The higher fungi. Academic Press, New York.

Malloch D, Cain RF. 1972 – The Trichocomataceae: Ascomycetes with Aspergillus, Paecilomyces and Penicillium imperfect states. Canadian Journal of Botany. 50, 2613–2628.

Suetrong S, Schoch CL, Spatafora JW, Kohlmeyer J et al. 2009 – Molecular systematics of the marine Dothideomycetes. Studies in Mycology 64, 155–173.

Zhang Y, Fournier J, Phookamsak R, Bahkali Ali H, Hyde KD. 2013c – Halotthiaceae fam. nov. (Pleosporales) accommodates the new genus Phaeoseptum and several other aquatic genera. Mycologia 105, 603–609.

 

Entry by

Sinang Hongsanan, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Science and Oceanography, Shenzhen University, Shenzhen 518060, People’s Republic of China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50002, Thailand

 

Published online 17 April 2026

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