nypae

Oxydothis Penz. & Sacc., Malpighia 11(11-12): 505 (1898) [1897]
= Merrilliopeltis Henn., Hedwigia 47: 261 (1908)
= Plagiolagynion Schrantz, Bull. trimest. Soc. mycol. Fr. 78: 218 (1962)
= Plagiothecium Schrantz, Bull. trimest. Soc. mycol. Fr. 76(4): 335 (1961)

Type species:

Oxydothis grisea Penz. & Sacc., Malpighia 11(11-12): 505 (1898) [1897]

Marine species:

Oxydothis nypae K.D.Hyde & A. Nakagiri, Trans Mycol. Soc. Japan 30:70 (1989)

Index Fungorum Number: 135913                   Face of fungi Number: N/A

Saprobic, endophytic or parasitic on dead rachides, petioles or leaves of mostly palms and some other monocotyledons. Sexual morph: Ascomata immersed in host tissues, solitary or aggregated, ellipsoidal or globose to subglobose, lenticular, slightly raised, as light or darkened discs, or under raised light or darkened blistering areas, usually lying horizontal to the host surface. Peridium comprising thick-walled, flattened, brown to dark brown, cells of textura prismatica to angularis, sometimes occasionally integrated with host cell walls. Hamathecium comprising hypha-like, filamentous, irregular, septate, paraphyses persisting between asci, but often fragmenting in dried material. Asci 8-spored, unitunicate, cylindrical, thin-walled, with a J+ (occasionally J-), wedge-shaped or discoid, subapical ring. Ascospores 1−4 seriate or fasciculate, hyaline, fusiform or filiform, 1-septate at the center, gradually tapering from the center to the ends, ends sometimes spine-like or rounded, smooth-walled. Asexual morph: Selenosporella sp. (descriptions from Samuels & Rossman 1987). Appressoria produced by germinating ascospores in some species, solitary, hyaline, light green, light brown, irregular in shape, thick-walled.

Saprobic, endophytic or parasitic on dead rachides, petioles or leaves of Nypa fruticans. Sexual morph: Ascomata of 175-290 μm high, 281-470 μm diam., immersed beneath host epidermis, solitary or aggregated, ellipsoidal or subglobose,coriaceoua, ostiolate, periphysate. Peridium 45-78 μm thick, outer layer numerous, comprising thick-walled, flattened, brown to dark brown cells. Hamathecium comprising hypha-like, filamentous, irregular, septate, paraphyses persisting between asci, but often fragmenting in dried material. Asci 198-349 x 8.5-12 μm, 8-spored, unitunicate, cylindrical, thin-walled, pedunculate, with a J+ (occasionally J-), wedge-shaped or discoid, subapical ring. Ascospores 78-113.6 x 2.5-4.1 μm, 1−4 seriate or fasciculate, hyaline, fusiform or filiform, 1-septate at the center, gradually tapering from the center to the ends, ends rounded with mucilage, guttulate, smooth-walled. Asexual morph: Undetermined.

Key references:

Fröhlich J, Hyde KD (2000) Palm Microfungi. Fungal Diversity Research Series 3, 1–393.

Hennings P (1908). Fungi Philippenses I. – Hedwigia 47: 250–265

Hyde KD. (1993a). Fungi from palms. VI. Reflections on Oxydothis and related genera. Sydowia 45: 204–225.

Hyde KD (1993b) Fungi from palms. VII. The genus Oxydothis from rachides of palms in north Queensland, including five new species. Sydowia 45: 226–240.

Hyde KD, Nakagiri A (1989). A new species of Oxydothis from the mangrove palm, Nypa fruticans. Transactions of the Mycological Society of Japan 30: 69–75.

Jeewon R, Liew ECY, Hyde KD (2003). Molecular systematics of the Amphisphaeriaceae based on cladistic analyses of partial LSU rDNA gene sequences. Mycological Research 107: 1392–1402.

Jones EBG, Suetrong S, Sakayaroj J, Bahkali AH, Abdel–Wahab MA, Boekhout T, Pang KL (2015). Classification of marine Ascomycota, Basidiomycota, Blastocladiomycota and Chytridiomycota. Fungal Diversity 73: 1–72.

Kang JC, Hyde KD, Kong RYC (1999) Studies on Amphisphaeriales: the Amphisphaeriaceae (sensu stricto). Mycological Research 103: 53–64.

Konta S, Hongsanan S, Tibpromma S, Thongbai B et al. (2106). An advance in the endophyte story: Oxydothidaceae fam. nov. with six new species of Oxydothis. Mycosphere 7: 1416–1436, doi:10.5943/mycosphere/7/9/15.

Penzig O, Saccardo PA (1897) Diagnoses fungorum novorum in Insula Java collectorum. Series secunda. Malpighia 11: 491–530.

Schrantz JP (1960). Recherches sur les pyrenomycetes de l'ordre des Diatrypales, sensu M. Chaudefaud, 1957. –Bull. Soc. Mycol. France 76: 305–407. (1962). Sur le Plagiothecium sabalensis (Cooke.) nob. (= Metasphaeria sabalensis Cooke.). – Bull. Soc. Mycol. France 78: 218.

Shenoy BD, Jeewon R, Hyde KD (2005). Oxydothis bambusicola, a new ascomycete with a huge subapical ascal ring found on bamboo in Hong Kong. Nova Hedwigia 80: 511–518.

Wang YZ, Hyde KD (1999). Hyponectria buxi with notes on the Hyponectriaceae. Fungal Diversity 3, 159 172.

Key to marine Oxydothis species:

1. Ascospores 1–septate, diam., wider than 6 μm, 74–92 μm long, fusiform, with apiculate ends                              O. nypicola

      1. Ascospores o–septate, diam., less than 6 μm, 82–113 μm long, ends rounded with mucilage                                O. nypae