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After the revision of the original material of Helvella rivularis, as well as of additional collections of this species made or determined by Dissing & Sivertsen, some personal Finnish collections are presented and discussed and the differences from close allies, H. fibrosa and H. macrosperma in particular, highlighted. The study includes also several other collections provided by the Oulu and Turku Herbaria and colour photographs of both gross morphology and micro-anatomical features. [ABSTRACT FROM AUTHOR]