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Abstract
Ascomata of 10 species assigned to family Nitschkiaceae were examined with a scanning electron microscope to reveal their distinctive features. These observations, along with biogeographical considerations of the 10 species, form the basis for a revised interpretation of the concepts used for those nitschkiaceous taxa in the Russian Far East. Four genera instead of five are recognized as a result of the unification of Nitschkia and Calyculosphaeria, whereas Calyculosphaeria grevillei is replaced by Nitschkia grevillei. The name Fracchiaea subcongregata is now applied to the entity formerly recognized as Fracchiaea broomeiana, and the species recorded originally as Nitschkia cupularis is now identified as Nitschkia parasitans. Two new species, Fracchiaea seticoronata and Nitschkia modesta, are described and discussed.
The scanning electron microscope was made available to us by the Far Eastern Center of Electron Microscopy of the A.V. Zhirmunsky Institute of Marine Biology (Vladivostok), and the authors are grateful for the help of engineer D.V. Fomin who helped to produce micrographs.