Pseudohalonectria Minoura & T. Muroi, Trans. Mycol. Soc. Japan 19(2): 132 (1978)

Index Fungorum number: IF 4437; 14 morphological species, 5 species with sequence data.
Type species: Pseudohalonectria lignicola Minoura & T. Muroi

Notes: Pseudohalonectria was introduced to accommodate P. lignicola (Minoura & Muroi 1978), without being assigned to an order or family (Minoura & Muroi 1978). Hongsanan et al. (2017) reviewed this genus and established a new family Pseudohalonectriaceae to accommodate this genus in Magnaporthales. The genus is characterized by bright yellow to brown ascomata, with long cylindrical, periphysate necks; unitunicate, cylindrical to clavate asci, with a J-, thimble- shaped, refractive apical rings and cylindrical, hyaline to slightly pigmented, and usually septate ascospores (Shearer 1989). Members in Pseudohalonectria are found in marine and terrestrial or freshwater habitats (Perera et al. 2016a).

Key to the species of Pseudohalonectria
1. Found in marine habitats, asci (4–) 8-spored ……………………………………………………………………………………… P. halophila
– Found in terrestrial or freshwater habitats, asci 8-spored ………………………………………………………………………………….. 2.
2. Ascospores 0–1-septate, surrounded by a mucilaginous sheath ………………………………………………………..
P. miscanthicola
– Ascospores aseptate or multi-septate, not surrounded by a mucilaginous sheath ………………………………………………….. 3.
3. Ascospores mostly longer than 85 μm …………………………………………………………………………………………………………… 4.
– Ascospores length less than 85 μm ……………………………………………………………………………………………………………….. 5.
4. Ascospores 6–16-septate, hyaline, falcate, found in aquatic habitats
…………………………………………………………..P. falcata
– Ascospores 4–8 septate, hyaline to pale yellow, filiform or sigmoid, found in terrestrial habitats………………P. longirostrum
5. Ascospores 0–3-septate, ascospores fusiform ……………………………………………………………………………….P. hampshirensis
– Ascospores more than 3 septate, ellipsoidal, cylindrical, filiform or very rarely fusiform …………………………………………..6.

6. Neck longer than 700 μm, ascospores hyaline ………………………………………………………………………………………………….7.
– Neck shorter than 700 μm, hyaline to pale orange, pale brown or pale pink ………………………………………………………… 9.
7. Ascomata 500–1000 μm in diameter, ascospores cylindrical ………………………………………………………………
P. aomoriensis
– Ascomata within 340–560 μm in diameter, ascospores filiform ……………………………………………………………………………8.
8. Asci longer than 120 μm, ascospores longer than 70 μm ………………………………………………………………………
P. palmicola
– Asci less than 80 μm, ascospores shorter than 65 μm …………………………………………………………………………… P. tayloriae
9. Ascospores longer than 70 μm, filiform or cylindrical ………………………………………………………………….. P. eubenangeensis
– Ascospores mostly smaller than 70 μm, ellipsoidal, rarely cylindrical, sometimes allantoid …………………………………….10.
10. Necks short (250 μm or less) …………………………………………………………………………………………………………
P. adversaria
– Necks long (250 μm or longer) …………………………………………………………………………………………………………………..11
11. Ascospores 33 μm or less, asci 104 μm or less ……………………………………………………………………………………..
P. fagicola
– Ascospores 34 μm or longer, asci 105 μm or longer ………………………………………………………………………………………..12
12. Asci and ascospores wide (asci 17.5 μm or longer, ascospores 7.5–12.5 μm) ………………………………………………
P. fuxianii
– Asci and ascospores thin (asci 18 μm or longer, ascospores 3.5–8.4 μm) …………………………………………………………….13
13 Ascospores consistently 5-septate, end cells lighter …………………………………………………………………………………..
P. lutea
– Ascospores 5- to 11-septate, hyaline or evenly pigmented throughout ………………………………………………………P. lignicola

Species

  • Pseudohalonectria lignicola

  • Pseudohalonectria lutea