ABSTRACT: This article reports a new genus and a new species Acanthofungus rimosus, which was collected in Taichung Prefecture in Taiwan. The generic and specific concepts of this new taxon are presented, based on studies of morphological and cultural characteristics. Separation among the genera Acanthofungus, Acanthophysellum, and Xylobolus is discussed. Acanthophysium is regarded as a synonym of Xylobolus. According to delimitations of the related genera, new combinations are proposed as follows: Acanthofungus ahmadii, A. thoenii, Xylobolus apricans, Acanthophysellum bertii, A. canadense, A. cerussatum, A. dextrinoideocerussatum, A. lapponicum, A. measaverdense, and A. minor.

KEYWORDS: Acanthofungus rimosus gen. et sp. nov., Aleurodiscus, Acanthophysellum, Acanthophysium, Gloeosoma, Taiwan, Xylobolus

NOMENCLATURAL NOVELTIES:
Acanthofungus Sheng H. Wu, Boidin & C. Y. Chien, p. 154
Acanthofungus ahmadii (Boidin) Sheng H. Wu, Boidin & C. Y. Chien, p. 159
Acanthofungus rimosus Sheng H. Wu, Boidin & C. Y. Chien, p. 155
Acanthofungus thoenii (Boidin, Lanq. & Gilles) Sheng H. Wu, Boidin & C. Y. Chien, p. 159
Acanthophysellum bertii (Lloyd) Sheng H. Wu, Boidin & C. Y. Chien, p. 160
Acanthophysellum canadense (Skolko) Sheng H. Wu, Boidin & C. Y. Chien, p. 160
Acanthophysellum cerussatum (Bres.) Sheng H. Wu, Boidin & C. Y. Chien, p. 160
Acanthophysellum dextrinoideocerussatum (Májon, M. N. Blanco & G. Moreno) Sheng H. Wu, Boidin & C. Y. Chien, p. 160
Acanthophysellum lapponicum (Litsch.) Sheng H. Wu, Boidin & C. Y. Chien, p. 160
Acanthophysellum measaverdense (Lindsey) Sheng H. Wu, Boidin & C. Y. Chien, p. 160
Acanthophysellum minor (Pilát) Sheng H. Wu, Boidin & C. Y. Chien, p. 160
Xylobolus apricans (Bourdot) Sheng H. Wu, Boidin & C. Y. Chien, p. 159