Fungalpedia – Note 162, Biporipsilonites (Fossil Fungi)


Biporipsilonites Kalgutkar & Janson.

Citation when using this data: Saxena RK & Hyde KD. 2024 (in prep) – Fungalpedia, Fossil Fungi. 

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1

Classification: Amerosporae, Fossil Fungi. 

Kalgutkar & Jansonius (2000) erected a new genus Biporipsilonites to accommodate Diporicellaesporites belluloides originally described by Song (1985) from the Early-Late Miocene (23–5 mya) sediments of Jiandingshan, Huangshi and Huatugou, Qaidam Basin, Qinghai Province, China. This genus comprises generally small to medium-sized, unicellate fungal spores with more or less elongated fusiform to barrel-shaped outlines with a plane of symmetry through the equator. The spore wall is generally smooth, occasionally with some subdued sculpture, and of medium thickness. Two terminal pores form pore chambers subtended by a basal septum and enclosed by a thin wall material that further thins centrifugally. Septa may show a central perforation and small septal folds; the terminal pore itself may be closed by fragile wall material or ruptured to gaping and broad. According to Kalgutkar & Jansonius (2000), pore chambers can differentiate spores in this genus from Diporisporites. The name of the genus is derived from the Latin bi-, or two, porate, and the wall’s smooth (Greek psilos) character. There are 11 records in Index Fungorum (2023) under this genus.

Type species: Biporipsilonites belluloides (Z.C. Song) Kalgutkar & Jansonius.



Figure 1 – Biporipsilonites belluloides (Z.C. Song) Kalgutkar & Janson. Scale bar = 8 μm. Redrawn from Kalgutkar & Jansonius (2000).



Kalgutkar RM, Jansonius J. 2000 – Synopsis of fungal spores, mycelia and fructifications. AASP Contribution Series 39, 1–423. 

Song ZC. 1985 – A research on Tertiary palynology from the Qaidam Basin, Qinghai Province. Edited by Research Institute of Exploration and Development, Qinghai Petroleum Administration, [and] Nanjing Institute of Geology and Palaeontology, Academia Sinica, 297 p. (in Chinese). Petroleum Industry Press.


Entry by

Ramesh K. Saxena, Birbal Sahni Institute of Palaeosciences, Lucknow, India


(Edited by Kevin D. Hyde, Samaneh Chaharmiri-Dokhaharani, & Achala R. Rathnayaka)