Parathyridariella dematiacea sp. nov. V. Prigione, A. Poli, E. Bovio and G.C. Varese

MycoBank number: MB 832837; Index Fungorum number: IF 832837; Facesoffungi number: FoF 11759;

Type. Italy, Tuscany, Mediterranean Sea, Elba Island (LI), Ghiaie ISL, 14–15 m depth, 42◦49’04”N, 10◦19’20”E, form the green alga Flabellia petiolata, 20 March 2010, R. Mussat-Sartor and N. Nurra, MUT 4884 holotype, living culture permanently preserved in metabolically inactive state by deep-freezing at Mycotheca Universitatis Taurinensis (MUT).

Additional material examined. Italy, Ligury, Mediterranean Sea, Riva Trigoso, Punta Manara (GE), 5–21 m depth, 44◦15j08.62”N 9◦24j17.64”E, from the seagrass Posidonia oceanica, March 2008, MUT 4419.

Etymology. In reference to the color of the colony on culture media.

Description. Growing actively on Pinus pinaster and Quercus ruber cork. Showing a floccose growth mainly on Pinus pinaster. Hyphae 2.8–4.8 µm wide, septate, hyaline to lightly pigmented. Chlamydospores numerous, mostly in chain, intercalary or solitary, globose to subglobose, from brownish to dark brown, 7–10 × 6–8 µm diameter. Sexual morph: not observed. Asexual morph: with differentiated conidiogenesis not observed.

Colony description. Colonies on MEASW attaining 28–34 mm diam after 28 days at 24 ◦C, mycelium from dark grey/black to dark green, dense with radial grooves and concentric rings, submerged edges; reverse dark green. Brown exudate present above the concentric rings. Growth on OASW reaching 40–54 mm diam at 24 ◦C and 21–29 mm diam at 15 ◦C; colonies on PDA attaining 36–49 mm diam and 15.5–22.5 mm diam at 24 ◦C and 15 ◦C, respectively.

Figure 2. Parathyridariella dematiacea sp. nov. 28-days-old colony at 21 ◦C on MEASW (A) and reverse (B); solitary (C) and in chain (D) chlamydospores. Scale bars: 10 µm (C, D).