Thalassodendromyces purpureus Vohnik & Reblova

Thalassodendromyces purpureus Vohník & Réblová, IMA Fungus 16 (e 157688): 22 (2025) Fig. 10 Culture characteristics. Filamentous, flat, filiform in margin, with colonies on seawater-supplemented PDA attaining 60–63 mm diam. after 14 days at 25 ° C, with no growth observed on Enhalus acoroides extract-amended PDA or standard PDA after 30 days at 25 ° C (three replicates), partly superficial and partly submerged, olivaceous brown center, lighter at the edges in forward view; reverse olivaceous with lighter margin. Micromorphology. Hyphae 5–6 μm wide, septate, smooth, olivaceous to brown, chlamydospores in chains, cells ellipsoidal, brown in color. The length of the chlamydospores varies between 13–30 × 7–14 μm (x ̄ = 21.2 × 10.8 µm, n = 10). Material examined. Sri Lanka • North Western Province, Puttalam District, Kalpitiya, Puttalam Lagoon, endophytic in healthy rhizomes of Enhalus acoroides, 23 August 2023, O. Rajakaruna & S. Udagedara, living cultures, En 13 = UOCCC 251206, UOCCC 251212. Notes. Our new strains (UOCCC 2512006 and UOCCC 251212) cluster with the ex-type of Thalassodendromyces purpureus (CBS 153577) and other putative strains with high statistical support (Fig. 5). In the original description, Réblová et al. (2025) did not observe chlamydospores or any other microscopic characteristics. However, our newly isolated strains produced chlamydospores in chains on seawater-supplemented PDA, but no growth was observed on standard PDA. To our knowledge, this is the first report of Thalassodendromyces purpureus from Enhalus acoroides and the first record of both the genus and species from Sri Lanka.