Morten Lange

Notes on the Genus Helvella in North America

In the course of present studies on the genus Helvella in Europe the authors have come across 110 American Helvella collections in European herbaria, and ample material was found of a species new to the flora: Helvella connivens. Seventeen species were represented in the Ameri? can material, and some of them are probably hitherto unrecognized in North America, viz. H. lactea Boud., H. fusca Gill. sensu Bres., and H. cupuliformis Diss. & Nannf. The 17 species are listed below. Capital letters indicate the museums where the material is preserved. It should be noted that this survey includes only the species which have been seen by the authors. Concerning American Helvella collections in the mentioned museums, the list is, however, considered to be almost complete. More detailed references to the collections are given by Dissing (1966). H. acetabulum (L. ex St.-Amans)

ARCTIC GASTEROMYCETES. THE GENUS BOVISTA IN GREENLAND AND SVALBARD

Divisions of the arctic zone and variations in climate and soil are briefly outlined. The genus Bovista is redefined by largely excluding sect. Globaria. Bovista tomentosa and B. limosa both reach the high arctic zone where they are confined to alkaline soils and subcontinental-continental climate. Bovista nigrescens is known from subarctic tracts where it grows in grassy pastures. Distribution of the species in other arctic, subarctic and alpine areas are indicated.