Pleosporales » Dictyosporiaceae » Dictyosporium

Dictyosporium olivaceosporum

Dictyosporium olivaceosporum Kaz. Tanaka, K. Hiray., Boonmee & K.D. Hyde

 

Index Fungorum number: IF551998; Facesoffungi number: FoF 02015

Etymology: ‘Olivaceosporum’ referring to pigmentation of conidia in olivaceous to brown.

Holotype: HHUF 30127

 

Saprobic on submerged twigs of woody plant. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Sporodochia on natural substrate scattered, 120–920 μm diam., punctiform. Conidiophores micronematous, not differentiated from vegetative hyphae. Conidiogenous cells holoblastic, cylindrical. Conidia 32–42(–44) × 20–28 μm (x̄ = 38.5 × 24.7 μm, n = 50), l/w 1.3–1.9(–2.1) (x̄ = 1.6, n = 50), solitary, ellipsoid to cylindrical, cheiroid, not complanate, consisting of 28–43 cells arranged in 5–6 rows and basal connecting cell (4.5–6 × 5–7 μm), olivaceous to brown. Appendages globose to subglobose, 8–12 μm diam. In culture conidia slightly larger than those on natural substratum formed. Conidia in culture 36–50 × 26–33 μm (x̄ = 45.7 × 29.1 μm, n = 33), l/w 1.3–1.8 (x̄ = 1.6, n = 33), consisting of 29–47 cells arranged in 5–6 rows.

 

Specimen examined: JAPAN, Okinawa, Isl. Iriomote, Uehara, near Tropical Biosphere Research Center (Ryukyu Univ.), small stream, on submerged twigs of woody plant, 13 July 2011, K. Hirayama and K. Tanaka (KH 375 = HHUF 30127, holotype), ex-type living culture JCM 19403 = MAFF 243829.

 

Notes: A new species Dictyosporium olivaceosporum is well distinguished from other Dictyosporium species in having conidia characterized by olivaceous to brown and presence of globose to subglobose appendages. Phylogenetic analyses of rDNA ITS sequence data placed D. olivaceosporum, previously reported as Dictyosporium aff. bulbosum (Tanaka et al. 2015), is close to D. aquaticum MF 1318, D. digitatum KH 401, KT 2660, yone 280 and D. tetrasporum KT 2856 (Boonmee et al. 2016), but they differ in conidial morphology (Fig. 12 in Boonmee et al. 2016 viz. Figs. 2, 3 in Chen et al. 1991, Figs. 1–5 in Cai and Hyde 2007, Fig. 62 in Liu et al. 2015).

 

References

Boonmee, S., D’souza, M.J., Luo, Z. et al. Dictyosporiaceae fam. nov. Fungal Diversity 80, 457–482 (2016). https://doi.org/10.1007/s13225-016-0363-z

Cai L, Hyde KD (2007) Anamorphic fungi from freshwater habitats in China: Dictyosporium tetrasporum and Exserticlava yunnanensis spp. nov., and two new records for Pseudofuscophialis lignicola and Pseudobotrytis terrestris. Mycoscience 48:290–296

Chen JL, Hwang CH, Tzean SS (1991) Dictyosporium digitatum, a new hyphomycete from Taiwan. Mycol Res 95:1145–1149

Liu JK, Hyde KD, Jones EBG, Ariyawansa HA, Bhat DJ, Boonmee S, Maharachchikumbura S, McKenzie EHC, Phookamsak R, Phukhamsakda C, Shenoy BD, Abdel-Wahab MA, Buyck B, Chen J, Chethana KWT, Singtripop C, Dai DQ, Dai YC, Daranagama DA, Dissanayake AJ, Doliom M, D’ souza MJ, Fan XL, Goonasekara ID, Hirayama K, Hongsanan S, Jayasiri SC, Jayawardena RS, Karunarathna SC, Li WJ, Mapook A, Norphanphoun C, Pang KL, Perera RH, Peršoh D, Pinruan U, Senanayake IC, Somrithipol S, Suetrong S, Tanaka K, Thambugala KM, Tian Q, Tibpromma S, Udayanga D, Wijayawardena NN, Wanasinghe D, Wisitrassameewong K, Abdel-Aziz FA, Adamčík S, Bahkali AH, Boonyuen N, Bulgakov T, Callac P, Chomnunti P, Greiner K, Hashimoto A, Hofstetter V, Kang JC, Lewis D, Li XH, Liu XX, Liu ZY, Matumura M, Mortimer PE, Rambold G, Randrianjohany E, Sato G, Sri-Indrasutdhi V, Tian CM, Verbeken A, von Brackel W, Wang Y, Wen TC, Xu JC, Yan JY, Zhao RL, Camporesi E (2015) Fungal diversity notes 1–110: taxonomic and phylogenetic contributions to fungal species. Fungal Divers 72:1–197

Tanaka K, Hirayama K, Yonezawa H, Sato G, Toriyabe A, Kudo H, Hashimoto A, Matsumura M, Harada Y, Kurihara Y, Shirouzu T, Hosoya T (2015) Revision of the Massarineae (Pleosporales, Dothideomycetes). Stud Mycol 82:75–136

Fig 1. Dictyosporium olivaceosporum (holotype) a Conidiomata on natural substrate b Conidia c–e Close up of conidia cells f Close up of conidium with apical appendages g Conidiomata produced in culture. Scale bars: a = 500 μm, b–f = 20 μm. (Boonmee et al. 2016)

 

 

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