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PREFACE
THE publication of this volume has been delayed owing to war conditions,
but the delay is the less to be regretted in that it has allowed
the inclusion of recent work on the subject. Much of the subject-matter
is of common knowledge to lichenologists, but in the co-ordination and
arrangement of the facts the original papers are cited throughout. The
method has somewhat burdened the pages with citations, but it is hoped
that, as a book of reference, its value has been enhanced thereby. The
Glossary includes terms used in lichenology, or those with a special licheno-
logical meaning. The Bibliography refers only to works consulted in the
preparation of this volume. To save space, etc., the titles of books and papers
quoted in the text are generally translated and curtailed: full citations-will
be found in the Bibliography. Subject-matter has been omitted from the
index : references of importance will be found in the Table of Contents or
in the Glossary.
I would record my thanks to those who have generously helped me
during the preparation :
I O
of the volume to Lady Muriel Percy for taking
notes of spore production, and to Dr Cavers for the loan of reprints. Prof.
Potter and Dr Somerville Hastings placed at my disposal their photographs
of the living plants. Free use has been made of published text-figures
which are duly acknowledged.
I have throughout had the inestimable advantage of being able to consult
freely the library and herbarium of the British Museum, and have thus been
able to verify references to plants as well as to literature. A special debt
of gratitude is due to my colleagues Mr Gepp and Mr Ramsbottom for
their unfailing assistance and advice.
LONDON,
February) 1920
A. L. S.