Astrosphaeriella aquatica K. D. Hyde
Etymology: From the Latin aquaticus meaning 'growing in water' in reference to the habitat.
Holotype: Papua New Guinea, Western Province, Bensbach, Bensbach River, in submerged rachides of Livistona sp., May 1992, K. D. Hyde 1373b, BRIP 21390.
Sexual morph: Ascomata developing under dark, conical, raised projections on the host surface, 520–650 µm diam., 185–260 µm high, on the host surface, mostly individual, with a central erumpent papilla; in horizontal section globose; in vertical section 390–520 µm diam., 186–260 µm high, conical, immersed beneath host tissue (cuticle and some epidermis), base applanate. Peridium black, carbonaceous, cells indistinguishable in 10 µm sections. Pseudoparaphyses up to 1.5 µm diam., trabeculae in a gelatinous matrix. Asci 130–164 × 14–16 µm, 8-spored, cylindrical, pedunculate, bitunicate, fissitunicate, with an ocular chamber. Ascospores 30–42 × 7–8 µm, biseriate, fusiform, bicelled, markedly constricted at the septum, hyaline, smooth-walled, with a wide spreading sheath which is drawn out at the poles.
Freshwater distribution: Papua New Guinea (Hyde 1994), Ecuador (Hyde and Frohlich 1998)
Hyde KD (1994) Aquatic fungi on rachides of Livistona in the Western Province of Papua New Guinea. Mycol Res 98:719–725. https://doi.org/10.1016/S0953-7562(09)81043-5
Figures 1–9. Astrosphaeriella aquatica. 1, 2. Ascomata on host surface, 3. Ascus, 4–9. Ascospores with spreading sheath
initially drawn out at the poles. Scale bars: 1 = 1 mm, 2 = 100 µm, 3–9 = 10 µm.