Henry Dissing

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)

Three 4-Spored Saccobolus Species from North East Greenland

Three 4-spored species of the coprophilous genus Saccobolus (Order Pezizales) from North East Greenland are treated, viz. Saccobolus quadrisporus, S. groenlandicus sp. nov. , and a third taxon for which only a preliminary description is provided. Saccobolus groenlandicus is also reported from Arctic Canada.

Lathraeodiscus Arcticus Gen. Nov., Sp. Nov. (Order Pezizales), A New Discomycete from North Greenland and Svalbard

ABSTRACTThe soil-inhabiting Lathraeodiscus arcticus gen. nov., sp. nov. (Pyronemataceae, Pezizales) is described from lowland high-arctic areas in Greenland and Svalbard. Lathraeodiscus arcticus is...

Four New Species of Discomycetes (Pezizales) from West Greenland

A stay in 1970-73 at the Arctic Station in Qegerttarssuaq (Godhavn), West Greenland made it possible for the Danish ecologist P. Milan Petersen to make more than 100 collections of operculate Discomycetes along the west coast of Greenland. The main purpose of this presentation is to describe four new species found in this material, viz. Lamprospora leptodictya, Scutellinia megalosphaera, Trichophaea arctica, and Urnula groenlandica. All descriptions are based on dried material. Before microscopic examination the material was placed overnight in tapwater. The revived material was cut on a freezing microtome, in general in 15 Asm thick sections, then stained in cotton blue. Some edaphic factors for Urnula groenlandica, viz. pH, conductivity, and loss of ignition were investigated in a preliminary way. A full survey of Discomycetes from 29 collecting sites distributed all over Greenland will be given elsewhere (Dissing, 1980). The material constitutes in total 30 genera and about 70 species.