Phaeocryptopus Naumov, Bull. Soc. mycol. Fr. 30(1): 424 (1915).
Adelopus Theiss., in Theissen & Sydow, Annls mycol. 15(6): 482 (1918) 
Cryptopus Theiss., Annls mycol. 12(1): 72 (1914)
Growing on conifer needles. Sexual state: Ascostromata black, globose to globose-depressed, erumpent or superficial, uniloculate, irregularly ostiolate, base embedded in the matrix, fused to erumpent hypostroma. Hamathecium lacking pseudoparaphyses. Asci 8-spored, cylindrical to cylindrical clavate, sessile and rounded at apex with a small ocular chamber. Ascospores uniseriate to triseriate, partially overlapping, hyaline, 1-septate, constricted at the septum, clavate or oblong with rounded ends, smooth-walled (Saccardo 1925; Von Arx and Müller 1954). Asexual state: See notes.
Notes: Phaeocryptopus was introduced by Naumov (1914) as a monotypic genus and Phaeocryptopus abietis Naumov. was assigned as the type. Petrak (1938) included another three species Phaeocryptopus gaeumannii (T. Rohde), Phaeocryptopus nudus (Peck) Petr. and Phaeocryptopus pinastri (Sacc. & Ellis) Petr. while Petrak (1962) added P. podocarpi (Syd. & P. Syd.) Petr.,. Butin (1970) included P. araucariae Butin, and P. australis Butin, while Farr (1984) added P. saxegotheae (Henn.) M.L. Farr, which has been referred to Dimerosporium. Müller and Von Arx (1950) included Phaeocryptopus in Venturiaceae. Barr (1987a) also classified Phaeocryptopus under Venturiaceae. Rhizosphaera species are generally accepted as asexual states of Phaeocryptopus, however the relationship has never been conclusively established (Winton et al. 2007). Presently P. nudus (Asterina nuda Peck), is considered as the type of Phaeocryptopus as the earliest introduced one. Phylogenetic analysis of Winton et al. (2007) and Schoch et al. (2009) showed that Phaeocryptopus gaeumannii clustered in Mycosphaerellaceae, Capnodiales while P. nudus nested in Dothioraceae, Dothideales. In our phylogenetic analysis Rhizosphaera kalkhoffii, R. oudemansii and Plowrightia abietis along with Phaeocryptopus nudus clustured in a subclade which might be considered to belong in a single genus Phaeocryptopus or could be two distinct genera. We name this subclade as Phaeocryptopus since Rhizosphaera abietis L. Mangin & Har. the type of Rhizosphaera, has no molecular data.
Type species: Phaeocryptopus nudus (Peck) Petr., Annls mycol. 36(1): 15 (1938).