(Wahlenb.) Keller, Gueidan & Thüs, Taxon 58: 194 (2009)
Eurotiomycetes, Subclass Chaetothyriomycetidae
Hydropunctaria Keller, Gueidan & Thüs, Taxon 58: 193 (2009)
Hydropunctaria maura (Wahlenb.) Keller, Gueidan & Thüs, Taxon 58: 194 (2009)
Amphibious marine or freshwater lichen-forming fungi with continuous to rimose or areolate crustose thallus, dark greyish olive to black, more rarely yellowish-brown or green, subgelatinous, often dotted with black punctae or columns. Perithecia immersed to half-immersed, globose to subglobose, 150-900 μm diam., with an apical to entire involucrellum. Involucrellum with upper surface often uneven and rough. Excipulum either pale with a brown ostiole or entirely pigmented. Hymenium colourless, K/I+ blue. Hamathecium consisting of periphyses and short pseudoparaphyses. Asci clavate, 8-spored, bitunicate. Ascospores simple, with a median length usually between 10-18 µm, hyaline, subglobose to ellipsoidal. Conidia sometimes present. Conidiospores simple, bacilliform (Description based on Clauzade & Roux (1985), Smith et al. (2009), Gueidan et al. (2009) and Orange (2012)).
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Key to marine Hydropunctaria species (adapted from Orange 2012):
- Dark tissue in thallus reaching the surface as distinctly elongated bars 40-400 x 40-60 µm, at least near the thallus margin, where they are perpendicular to the thallus margin; apex of perithecium plane or crenulate; cortical pigment brown H. amphibia
- Dark tissue in the thallus in the form of small isodiametric punctae or occasionally minute ridges 20-90 x 20-40 µm, visible or not at the thallus surface 2
- Thallus relatively thick, 60-300 µm, mostly cracked into discrete areoles; cortical pigment brown (rarely in part greenish brown) H. maura
- Thallus relatively thin, up to 200 mm thick, cracks sparse to numerous, thallus always thinner and less cracked than H. maura when the species are growing contiguously; cortical pigment brown or green 3
- Cortical pigment brown 4
- Cortical pigment dull green to green-brown 5
- On siliceous rock in Wales and SW Ireland H. oceanica
- On calcareous rock in the Mediterranean and Black Sea H. adriatica
- Currently known from N Norway and NW Scotland H. aractina
- Currently known from Wales and Ireland H. orae