Isthmosporella
Isthmosporella Shearer & Crane
Index Fungorum number: IF 28249
Saprobic on submerged wood. Sexual morph: Ascomata scattered on natural substrate, immersed to superficial, globose, oblique, black, glabrous, membranous, rostrate. Neck short, cylindrical, periphysate. Peridium two-layered, outer layer composed of brown, fusoid-cylindric pseudoparenchyma cells, inner layer composed of compressed, subhyaline to light brown, fusoid cells. Pseudoparaphyses sparse, cellular, broad, hyaline, septate. Asci 8-spored, bitunicate, fissitunicate, ventricose to clavate, broadly rounded at the apex, without an apical apparatus or oculus, short pedicellate. Ascospores tri- to tetra-seriate, cylindrical to fusoid, isthmoid at center, tapering at both ends, straight to slightly curved, hyaline, phragmoseptate, constricted at septa, surrounded by a gelatinous sheath (Shearer and Crane 1999). Asexual morph: Undetermined. (Description from Dong et al. 2020)
Type species: Isthmosporella pulchra Shearer & Crane
Notes: The monotypic genus Isthmosporella, typified by I. pulchra Shearer & Crane, was collected from submerged, decorticated wood in USA (Shearer and Crane 1999). It was initially placed in Phaeosphaeriaceae based on its small, globose ascomata, relatively undifferentiated peridium of small pseudoparenchymatic cells, and sparse pseudoparaphyses (Shearer and Crane 1999). However, the ventricose to clavate asci, cylindrical to fusoid ascospores with isthmoid at center do not fit with the familial concept of Phaeosphaeriaceae (Hyde et al. 2013). It is placed in Pleosporales genera incertae sedis (Wijayawardene et al. 2018, 2020), until its DNA data are obtained. One collection of Isthmosporella pulchra (A254-2), collected from the type locality by its author (Dr. Lee Crane), is illustrated. (Description from Dong et al. 2020)
List of freshwater Isthmosporella species
Isthmosporella pulchra Shearer & Crane, 91: 142 (1999)
Freshwater distribution: USA (Shearer and Crane 1999)
References
Hyde KD, Jones EBG, Liu JK, Ariyawansa H, Boehm E, Boonmee S, Braun U, Chomnunti P, Crous PW, Dai DQ, Diederich P, Dissanayake A, Doilom M, Doveri F, Hongsanan S, Jayawardena R, Lawrey JD, Li YM, Liu YX, Lücking R, Monkai J, Muggia L, Nelsen MP, Pang KL, Phookamsak R, Senanayake I, Shearer CA, Suetrong S, Tanaka K, Thambugala KM, Wijayawardene NN, Wikee S, Wu HX, Zhang Y, Aguirre-Hudson B, Alias SA, Aptroot A, Bahkali AH, Bezerra JL, Bhat DJ, Camporesi E, Chukeatirote E, Gueidan C, Hawksworth DL, Hirayama K, Hoog SD, Kang JC, Knudsen K, Li WJ, Li XH, Liu ZY, Mapook A, McKenzie EHC, Miller AN, Mortimer PE, Phillips AJL, Raja HA, Scheuer CH, Schumm F, Taylor JE, Tian Q, Tibpromma S, Wanasinghe DN, Wang Y, Xu JC, Yan JY, Yacharoen S, Zhang M (2013) Families of Dothideomycetes. Fungal Divers 63:1–313.
Shearer CA, Crane JL (1999) Freshwater Ascomycetes: Isthmosporella pulchra gen. et sp. Mycologia 91:141–144
Wijayawardene NN, Hyde KD, Al-Ani LKT, Tedersoo L, Haelewa- ters D, Rajeshkumar KC, Zhao RL, Aptroot A, Leontyev DV, Saxena RK, Tokarev YS, Dai DQ, Letcher PM, Stephenson SL, Ertz D, Lumbsch HT, Kukwa M, Issi IV, Madrid H, Phillips AJL, Selbmann L, Pfliegler WP, Horváth E, Bensch K, Kirk PM, Kolaříková K, Raja HA, Radek R, Papp V, Dima B, Ma J, Malosso E, Takamatsu S, Rambold G, Gannibal PB, Triebel D, Gautam AK, Avasthi S, Suetrong S, Timdal E, Fryar SC, Delgado G, Réblová M, Doilom M, Dolatabadi S, Pawłowska J, Humber RA, Kodsueb R, Sánchez-Castro I, Goto BT, Silva DKA, de Souza FA, Oehl F, da Silva GA, Silva IR, Błaszkowski J, Jobim K, Maia LC, Barbosa FR, Fiuza PO, Divakar PK, Shenoy BD, Castañeda-Ruiz RF, Somrithipol S, Lateef AA, Karunarathna SC, Tibpromma S, Mortimer PE, Wanasinghe DN, Phookamsak R, Xu J, Wang Y, Tian F, Alvarado P, Li DW, Kušan I, Matočec N, Maharachchikumbura SSN, Papizadeh M, Heredia G, Wartchow F, Bakhshi M, Boehm E, Youssef N, Hustad VP, Lawrey JD, Santiago ALCMA, Bezerra JDP, Souza-Motta CM, Firmino AL, Tian Q, Houbraken J, Hongsanan S, Tanaka K, Dissanayake AJ, Monteiro JS, Grossart HP, Suija A, Weerakoon G, Etayo J, Tsurykau A, Vázquez V, Mungai P, Damm U, Li QR, Zhang H, Boonmee S, Lu YZ, Becerra AG, Kendrick B, Brearley FQ, Motiejūnaitė J, Sharma B, Khare R, Gaikwad S, Wijesundara DSA, Tang LZ, He MQ, Flakus A, Rodriguez-Flakus P, Zhur- benko MP, McKenzie EHC, Stadler M, Bhat DJ, Liu JK, Raza M, Jeewon R, Nassonova ES, Prieto M, Jayalal RGU, Erdoğdu M, Yurkov A, Schnittler M, Shchepin ON, Novozhilov YK, Silva- Filho AGS, Liu P, Cavender JC, Kang Y, Mohammad S, Zhang LF, Xu RF, Li YM, Dayarathne MC, Ekanayaka AH, Wen TC, Deng CY, Pereira OL, Navathe S, Hawksworth DL, Fan XL, Dis- sanayake LS, Kuhnert E, Grossart HP, Thines M (2020) Outline of Fungi and fungus-like taxa. Mycosphere 11:1060–1456
Wijayawardene NN, Hyde KD, Lumbsch HT, Liu JK, Maharachchi- kumbura SSN, Ekanayaka AH, Tian Q, Phookamsak R (2018) Outline of Ascomycota: 2017. Fungal Divers 88:167–263
Recent Genus
1Neochlamydotubeufia
Neohelicomyces
Recent Species
Neohelicomyces submersusNeohelicomyces hyalosporus
Neohelicomyces grandisporus