Phaeoisaria Höhn., Sber. Akad. Wiss. Wien, Math.

Bagacay, Jan Felnesh Exe, Canto, Carr Marlo, Opiña, Lilcah Angelique, Nim, James Ariel, Velo, Jasmine, Lopez, Thomas Angelo, Ferriols, Victor Marco Emmanuel N., Sadaba, Resurreccion B. & Calabon, Mark S., 2025, Pleurotheciaceae in Philippine freshwater ecosystems: new records, asexual morph report of Phaeoisaria filiformis, and phylogenetic assessment, Phytotaxa 682 (2), pp. 121-137 : 127

Phaeoisaria Höhn., Sber. Akad. Wiss. Wien, Math. -naturw. Kl., Abt. 1 118: 330 (1909)

Asexual morph: Conidiomata synnematal, indeterminate, scattered, erect, rigid, dark brown to black, composed of compactly and parallelly adpressed conidiophores. Conidiophores macronematous, synnematous, individual threads narrow, branched towards the apices, brown to dark brown, smooth, straight or flexuous, splaying out near the apex and along the sides of the upper half of each synnema. Synnemata erect, rigid, dark brown to black, velvety, smooth, composed of compactly and parallelly adpressed conidiophores, with flared conidiogenous cells in the above half. Conidiogenous cells polyblastic, terminal and intercalary, mostly discrete, sometimes integrated, recurved, smooth, sympodial extended, denticulate; denticles cylindrical, subhyaline to pale brown, sympodial, each with one to several denticulate conidiogenous loci. Conidia solitary, dry, acropleurogenous, fusiform, ellipsoidal to obovoidal or cylindricovate, straight, aseptate and/or septate, guttulate, smooth-walled, hyaline or subhyaline. Sexual morph: Ascomata superficial to immersed, globose to elongate globose, with a long neck. Paraphyses numerous, filamentous, branched, septate, smooth. Asci 8-spored, unitunicate, cylindrical, thin-walled, with a small refractive apical apparatus, smooth-walled. Ascospores filiform, guttulate, tapered at both ends, septate, hyaline, smooth-walled. Description adapted from Ellis (1971) and Luo et al. (2019).