Potemkin, A.D. & E.V. Sofronova. Taxonomic study on the genus Cephalozia
in Russia and circumscription of the genus
Arctoa (2013) 22: 173-206
Polyphyletic origin
of the genus Cephalozia shown by recent molecular studies excludes
aceptance of traditional concept of the genus and presumes its splitting into Cephalozia
s.str. (C. bicuspidata and related species, C. macounii) and Fuscocephaloziopsis
(incl. Pleurocladula, Schofieldia, Metahygrobiella), which morphological
distinctions are unclear, or circumscription of Cephalozia sensu lato,
including all abovementioned genera and Nowellia. Recently established
the Jurrasic age of the family Cephaloziaceae s. l., monophyletic origin of all
investigated species of Cephalozia, Fuscocephaloziopsis, Metahygrobiella,
Nowellia, Pleurocladula, Schofieldia and common morphology support
such a broad circumscription of Cephalozia. Two new nomenclature
combinations – C. monticola (J.D. Godfrey) Potemkin & Sofronova,
comb. nov. и C. albula
(Steph.) Potemkin & Sofronova, comb. nov. – are
suggested. Seventeen species of Cephalozia sensu lato are
recognized for Russia. The key to them, their descriptions, known distribution
in Russia, world distribution, ecology, citation of selected illustrations and
specimens, description of variability and differentiation as well as original
illustrations of principal taxonomic characters are provided for every species.
Integrity of Cephalozia sensu lato is confirmed by SEM images of spore
surface of C. affinis, C. albescens, C. bicuspidata, C. catenulata,
C. connivens, C. curvifolia, C. leucantha, C. loitlesbergeri, C.
macounii, C. monticola and C. pleniceps that demonstrate
± common pattern of outgrowths and are distinct in their density, length,
thickness and development of secondary outgrowths.