The North American species of Psathyrella.

MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

ADVISORY BOARD

WILLIAM C. STEERE, President
The New York Botanical Garden
BASSETT MAGUIE, Senior Scientist
The New York Botanical Garden

Howmuw S. IRwIN, Executive Director
The New York Botanical Garden
ARTHUR CRONQUIST, Director of Botany
The New York Botanical Garden

EDITORIAL BOARD
CLARK T. ROGERSON, Editor
The New York Botanical Garden
Bronx, New York 10458

SHERWIN CARLQUIST
Rancho Santa Ana Botanic Garden
PETER RAVEN, Director
Missouri Botanical Garden

RRoGos MCVAUGH, Curator
University of Michigan
HAROLD W. RIcKETT
The New York Botanical Garden

John WUpAcK, Curator
Smithsonian Institution
The MEMOIRS are published at irregular intervals in issues and volumes of
various sizes and are designed to include results of original botanical research by
members of the Garden's staff, or by botanists who have collaborated in one or more
of the Garden's research programs. Ordinarily only manuscripts of fifty or more
typewritten pages will be considered for publication.
Manuscripts should be submitted to the Editor. For further information regarding editorial policy and instructions for the preparation of manuscripts, address the
Editor.
Prior to publication, standing orders for forthcoming issues and volumes should
be placed with:
Publications Office
The New York Botanical Garden
Bronx, N.Y. 10458
After publication orders should be sent to our agent for back issues, volumes, and
reprints:
Hafner Service Agency, Inc.
866 Third Avenue
New York, N.Y. 10022
Authors of papers may obtain reprints at cost, if ordered at the same time the
issue is printed.
Library of Congress Catalog Card ANumber 66-6394

(continued on inside back cover)