Fungalpedia – Note 1540, Gampsonema
Gampsonema. Nag Raj.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1
Classification: Incertae sedis, Incertae sedis, Incertae sedis, Incertae sedis, Pezizomycotina, Ascomycota, Fungi
Saprobic on dead bark of Eucalyptus eximia and dead leaves of E. grandis, E. paniculata, E. robusta, E. saligna and Eucalyptus sp. (Myrtaceae) (Nag Raj 1993). Sexual morph: undetermined. Asexual morph: Conidiomata brown to dark brown, pycnidial, scattered, immersed to innate erumpent, globose, unilocular, glabrous, ostiolate. Ostiole single, circular, papillate, centrally located. Conidiomatal wall composed of thick-walled, dark brown cells of textura angularis in the exterior, becoming thin-walled, brown to pale brown cells of textura prismatica in the inner part. Conidiophores formed from the inner wall layer of conidiomata, hyaline, cylindrical or irregular, branched, septate, smooth-walled. Conidiogenous cells hyaline, holoblastic, sympodial, ampulliform or cylindrical, integrated or discrete, determinate, smooth-walled. Conidia hyaline, naviculate or narrow-fusiform, rounded at the apex and blunt at the base, slightly curved, 2-septate, smooth-walled; with 2 apical appendages; appendages filiform, unbranched, reflexed, more or less lateral, delimited from conidia by septa (adapted from Nag Raj 1993).
Notes: Gampsonema is monotypic and no molecular data is available. This genus can be confused with Hyalotiella, as they have pycnidial conidiomata, holoblastic, sympodial conidiogenous cells and septate conidia with apical appendages. Gampsonema has hyaline, naviculate or narrow-fusiform, 2-septate, conidia bearing 2 unbranched, apical appendages, whereas Hyalotiella has pale brown except for the hyaline apical cell, 3–4-septate, unequal cells conidia bearing branches 2–4, mostly 3, divergent, apical appendages (Nag Raj 1993, Li et al. 2015b). This genus need to be revised based on fresh collections and molecular data.
Type species: Gampsonema exile (Tassi) Nag Raj [as ‘exilis’], Canad. J. Bot. 53(16): 1623 (1975).
Figure 1 – Gampsonema exile (redrawn from Nag Raj 1993) a Vertical section of conidioma. b Conidia. c Conidiophores, conidiogenous cells and developing conidia.
d Conidiomatal wall with tissue details and conidiophores.
References
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.