Pleosporales » Astrosphaeriellaceae » Acuminatispora

Acuminatispora palmarum

Acuminatispora palmarum

S.N. Zhang, K.D. Hyde & Jian K. Liu Mycological Progress 17(10): 1181 (2018)

 

Classification: Ascomycota-Pezizomycotina-Dothideomycetes-Pleosporomycetidae-Pleosporales-Astrosphaeriellaceae-Acuminatispora

 

Host species: Nypa fruticans, Phoenix paludosa

 

Holotype: MFLU 18-1068

 

Known distribution: Chanthaburi, Ranong, and Trat Province, Thailand

 

IF Number: IF825526      Mycobank Number: 825526      FOF Number: FoF04672

 

Description

Saprobic on petioles and rachides of palms in mangrove habitats. Sexual morph: Ascomata 380–610 µm high (including neck), 150–395 µm diam. (x̅ = 531.2 × 275.8 µm, n = 10), black, subglobose, solitary, scattered, immersed, with an erumpent short neck. Ostiole 72–85 µm diam., central, periphysate, cylinder-like opening. Peridium 10–20 µm wide, composed several brown outside layers and inter layers with hyaline cells of textura angularis. Hamathecium up to 2.5 µm wide, comprising numerous, filamentous, hyaline, branched, trabeculate pseudoparaphyses, embedded in a gelatinous matrix. Asci 93–125 × 13–22 µm, (x̅ = 109.5 × 16 µm, n = 15), 8-spored, bitunicate, cylindrical, slightly curved, long pedicellate, apically rounded with an ocular chamber. Ascospores 24–30 × 7–10 µm (x̅ = 27.2 × 8.1 µm, n = 30), overlapping biseriate to triseriate, hyaline to brown, fusiform with small, hyaline, acute or narrowly pointed ending cells, 1-(rarely 3) septate, strongly constricted at the central septa, the upper cell broader, each cell with one large guttule and sometimes several small ones, smooth-walled, lacking a sheath or appendages. Asexual morph: Undetermined.

 

Culture conditions: Colonies growing well on both PDA and MEA media and attaining a diameter about 1.5 cm on PDA after 21 days at 25ºC, obverse olive to grey-green or light grey-green, tufted colony center elevated, reverse dark green.

 

 

Acuminatispora palmarum (MFLU 18-1068, holotype; MFLU 18-1071, paratype). a-c Appearance of ascomata on host surface. d Vertical section of ascoma. e Ostiolar with periphyses. f Structure of peridium. g Trabeculate pseudoparaphyses. h-k Asci. l-q Ascospores. q, 3-septate ascospore in lactophenol cotton blue reagent with acute ends clearly. s-r Germinating ascospores. t Colony on PDA. Scale bars: a = 500 μm, b-c = 100 μm, d = 200 μm, f, h-k = 20 μm, e, g, l-s = 10 μm.

 

 

Reference

Zhang, S.N. et al. (2018) Acuminatispora palmarum gen. et sp. nov. from mangrove habitats. Mycological Progress 17:1173–1188

 

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