Pedumispora rhizophorae K.D.Hyde & E.B.G.Jones

Dayarathne, Monika C., Wanasinghe, Dhanushka N., Devadatha, B., Abeywickrama, Pranami, G, E. B., Jones, areth, Chomnunti, Putarak, Sarma, V. V., Hyde, Kevin D., Lumyong, Saisamorn, C., Eric H. & Mckenzie, 2020, Modern taxonomic approaches to identifying diatrypaceous fungi from marine habitats, with a novel genus Halocryptovalsa Dayarathne & K. D. Hyde, gen. nov., Cryptogamie, Mycologie 20 (3), pp. 21-67 : 56

Pedumispora rhizophorae K.D.Hyde & E.B.G.Jones ( Fig. 17 )

Mycological Research 96 (1): 78 (1992).

Material examined. — Thailand, Ranong, on twig of Rhizophora apiculata, XI.1988 , K. D. Hyde (BRIP 19201 holotype).

DISTRIBUTION. — Micronesia, Seychelles, Thailand.

DESCRIPTION

Ascomata. 120-130 µm high, 420-500 µm in diameter, brown to black, subglobose, coriaceous, ostiolate, papillate, pseudos - tromatic tissues surrounding each ascoma. Necks erumpent.

Paraphyses. 4-8 µm thick, filiform and simple.

Asci. 200-248 × 20-37 µm, 8-spored, irregularly fusiform, pedicellate, unitunicate, thin-walled, without an apical ring.

Ascospores. 153-210 ×4-5.5 µm, filiform, tapering towards both ends, the end cells lack cytoplasmic contents and appear curved or hook-shaped at one end, 12-13-septate, not constricted at the septa, with longitudinal striations running the length of the ascospore, slightly brown.

NOTES

Pedumispora rhizophorae is seldom reported from tropical mangrove habitats ( Jones et al. 2009, 2013). It was originally collected from decayed intertidal prop roots and twigs of Rhizophora apiculata at Ranong Province, southern Thailand ( Hyde & Jones 1992). Later collections were made on R. mucronata from Seychelles ( Hyde & Jones 1992) and mangrove wood from Guam, ( Sakayaroj et al. 2005). Hyde & Jones (1992) included Pedumispora rhizophorae in Melanconidaceae , Diaporthales , as it has similar characters to Prosthecium and Winterella . A preliminary phylogenetic study, based on LSU sequence data of the strain obtained from Guam, revealed that Pedumispora rhizophorae has an affinity with the Xylariales , and in particular with the Diatrypaceae ( Sakayaroj et al. 2005; Jones et al. 2009). Klaysuban et al. (2014) re-examined the morphology of this fungus and and confirmed its taxonomic position within Diatrypaceae through a molecular phylogenetic study with LSU and ITS sequences.

Figures

FIG. 17. — Pedumispora rhizophorae K.D.Hyde & E.B.G.Jones (BRIP 19201 – holotype): A, herbarium material; B, C, appearance of ascostromata on host; D, section through ascoma; E, section through neck region; F, peridium; G, paraphyses; H, I, asci; J, K, ascospores. Scale bars: B, 1000 μm; C, 500 μm; D, 50 μm; E-G, 20 μm; H-K, 100 μm.