From a survey of dictyosporous North American taxa in the Pleosporales (Loculoascomycetes), descriptions of 82 species in 17 genera belonging to 11 families are provided. Other dictyosporous genera are mentioned briefly and a key is provided to separate the genera. In the appendix, dictyosporous taxa in the other orders of Loculoascomycetes and a few Hymenoascomycetes are listed alphabetically; disposition is made for several species. A host index lists substrates and taxa that inhabit them. Six new species are proposed: Pleomassaria hesperia Barr, Teichospora bartholomewii Barr, T. ribis Barr, Graphyllium californianum Barr, Chaetoplea apicirubida Barr, Coccodinium citricola, one new subspecies Cilioplea coronata subsp. montana Barr, and one new name Teichospora minimispora Barr.
New combinations include: Pleospora pygmaea (Ellis & Everh.) Barr, Cucurbitaria tenacella (Fr.) Barr, Teichospora borealis (Ellis & Everh.) Barr, T. comptoniae (Ellis & Everh.) Barr, T. congesta (Cooke & Ellis) Barr, T. coremae (Ellis & Everh.) Barr, T. juglandis (Ellis & Everh.) Barr, T. quercina (Ellis & Everh.) Barr, T. sambuci (Earle) Barr, T. zabriskeana (Ellis & Everh.) Barr, Phaeosphaeria vitalbae (DeNot.) Barr, Graphyllium pentamerum (Karsten) Barr, G. permundum (Cooke) Barr, Chaetoplea amygdaloides (Ellis & Everh.) Barr, C. aspera (Ellis & Everh.) Barr, C. carpinicola (Ellis & Everh.) Barr, C. crossata (Ellis & Everh.) Barr, C. ellisii (Sacc. & P. Sydow) Barr, C. helenae (Ellis & Everh.) Barr, C. hyphasmatis (Ellis & Everh.) Barr, C. longispora (Wegelin) Barr, C. nubilosa (Ellis & Everh.) Barr, C. oblongata (Niessl) Barr, C. stenocarpa (Ellis & Everh.) Barr, C. strigosa (Ellis & Everh.) Barr, C. umbilicata (Ellis) Barr, C. variabilis (Ellis & Everh.) Barr, Cilioplea fulgurata (Ellis & Everh.) Barr, Mycoglaena canadensis (Ellis & Everh.) Barr, M. alni (Dearness & House) Barr, Tryblidaria cucurbitaria (Cooke) Barr, Berlesietta minima (Ellis & Everh.) Barr, Rhytidhysteron opuntiae (J. G. Brown) Barr, and Strigopodia spongiosa (Barr) Barr.