Jahnulales » Aliquandostipitaceae

Aliquandostipite

Aliquandostipite Inderbitzin

Index Fungorum number: IF 28650

 

Saprobic on submerged wood or fallen, decorticated branch. Sexual morph: Mycelium visible on the substratum, of wide hyphae (> 10 µm and up to 50 µm wide), which may bear ascomata. Ascomata scattered to clustered or gregarious, immersed to erumpent or superficial, uniloculate, globose to broadly ellipsoidal, dimorphic, with or without stalk-like hypha attached to the base, hyaline or pale brown when young, turn to dark brown with age, membranous, papillate. Peridium thin, one-layered, composed of pale brown, thin-walled cells of textura angularis to globosa. Pseudoparaphyses numerous, cellular, sparsely branched, hyaline, septate. Asci 8-spored, bitunicate, fissitunicate, clavate, with thickened apical region. Ascospores bi- to multi-seriate, variably arranged, oval, pale brown, 1-septate, constricted at the septum, usually asymmetric, mostly with a well-developed hyaline sheath (Inderbitzin et al. 2001). Asexual morph: Undetermined.

 

Notes: Aliquandostipite was introduced to accommodate two species A. khaoyaiensis Inderb. and A. sunyatsenii Inderb., which form dimorphic ascomata (sessile and stalked) and the widest hyphae known from ascomycetes (Inderbitzin et al. 2001). However, with Jahnula sequences added in the phylogenetic tree, A. sunyatsenii clustered in Jahnula with high bootstrap support, which was therefore transferred to Jahnula based on limited data (Pang et al. 2002). Among six species recorded in Index Fungorum (2020), four have been confirmed in Aliquandostipite with molecular data (Huang et al. 2018; Hyde et al. 2019). Aliquandostipite is similar to Jahnula, but can be distinguished from the latter by its hyaline or less pigmented ascomata and larger asci and ascospores. According to our observations and literature, the ascospores of A. crystallinus Raja et al., A. khaoyaiensis and A. minuta Raja & Shearer form acicular crystals when stored in lactic acid and glycerin (Raja et al. 2005; Raja and Shearer 2007). These three taxa, however, can be distinguished based on the gelatinous sheath and appendages on ascospores. Aliquandostipite siamensiae (Sivichai & E.B.G. Jones) J. Campb. et al. is the only species producing dimorphic ascospores. Aliquandostipite manochiae Sriindr. et al. is distinct in that it has branched and anastomosing pseudoparaphyses, lacking arcicular crystals within the spores, and ascospore size (Liu et al. 2015). Aliquandostipite manochiae might be synonymous with A. khaoyaiensis (Inderbitzin et al. 2001) based on their similar morphological features, overlapping dimension of ascomata, asci, and ascospores, and their freshwater habitats. Molecular data are necessary to confirm A. manochii as a unique species.

 

Type species:  Aliquandostipite khaoyaiensis Inderb., Am. J. Bot. 88(1): 54 (2001)

 

References:

Dong, W., Wang, B., Hyde, K.D., McKenzie, E.H.C., Bhat, D.J et al. (2020) Freshwater Dothideomycetes. Fungal Diversity

Huang SK, Maharachchikumbura SSN, Jeewon R, Bhat DJ et al. (2018) Morphological and molecular taxonomy of Jahnula dianchia sp. nov. (Jahnulales) from submerged wood in Dianchi Lake. Yunnan China. Mycological Progress 17, 547–555

Hyde KD, Tennakoon DS, Jeewon R, Bhat DJ et al. (2019) Fungal diversity notes 1036–1150: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Diversity 96, 1–242

Inderbitzin P, Landvik S, Abdel-Wahab MA, Berbee ML (2001) Aliquandostipitaceae, a new family for two new tropical ascomycetes with unusually wide hyphae and dimorphic ascomata. Americal Journal of Botany 88, 52–61

Liu JK, Hyde KD, Jones EBG, Ariyawansa HA et al. (2015) Fungal diversity notes 1–110: taxonomic and phylogenetic contributions to fungal species. Fungal Diversity 72, 1–197

Pang KL, Abdel-Wahab MA, Sivichai S, El-Sharouney HM et al. (2002) Jahnulales (Dothideomycetes, Ascomycota): a new order of lignicolous freshwater ascomycetes. Mycological Research 106, 1031–1042

Raja HA, Ferrer A, Shearer CA (2005) Aliquandostipite crystallinus, a new ascomycete species from wood submerged in freshwater habitats. Mycotaxon 91, 207–215

Raja HA, Shearer CA (2007) Freshwater ascomycetes: Aliquandostipite minuta (Jahnulales, Dothideomycetes), a new species from Florida. Mycoscience 48, 395–398

 

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