A slimmed-down version of the CD, for evaluation, is available via this [link]. Please note that the tables, the Glossary and the Synonym list are incomplete and that the only species to which there are live links is P. acetabulum.

This CD-Rom is an essential aid to the identification of the 47 species of British Isles Parmelia supplementing the maps and text of the first fascicle of The Lichen Atlas of the British Isles and may be ordered through the link to 'Publications' at the top of this page.

• Access through current names or synonyms, each with B.L.S. identification numbers.
• 117 high quality colour photographs in a readily accessible and inexpensive form.
• Up to 4 photographs of every species highlighting the distinctive features.
• Descriptions of each photograph.
• Results of Pd, K, KC and C chemical spot tests and UV response.
• Table of major chemical constituents indicated by TLC.
• Cross-references to similar species.
• A table of habitats showing likelihood of occurrence on different substrates.
• Descriptions of each of the revised genera.
• An improved key based on the Flora key.
• An extensive glossary of lichen terms.
• The original distribution maps and text of the Atlas.
• Over 4,000 links to provide easy navigation through the document.

The CD-Rom is designed to be 'user-friendly'. A single mouse-click on a link, be it a section reference, the name of a Parmelia or a couplet number in the key, will take the user directly to the relevant point in the document.

The document (26Mb) is written in HTML, the language of the Internet, and is therefore accessible by users of computer of all types.

Requirements - access to a computer with the facility to read a CD-Rom and a web browser

Speed of access will depend on the specification of the computer and the browser. Browsers are being constantly 'improved'; updates are readily available on CDs with many computer magazines. The Society can supply a free browser, usable only on Acorn computers.

We regret that the B.L.S. cannot offer technical support and advice on suitability of your equipment. Please refer to your computer supplier.

ISBN 0 9523049 4 5

Although the material is presented in machine-readable form on CD-Rom, it should be regarded as copyright material. Only the purchaser of the CD has the right to access it, on a single computer, unless authorization to do otherwise is granted by the British Lichen Society, in writing. You will not have the right to copy, reproduce or distribute it, other than as follows:

1. The licence to use the CD is for a single user on a single machine. If you wish to make it, or any part of it, available over any network, or other access system, prior written permission must be granted by the British Lichen Society.
2. You may print single copies only of any part of the CD, solely for your personal use.
3. You may not, without written permission from the British Lichen Society, sell, pass on, give away or otherwise distribute the CD or any part of the contents of the CD, in any form, whether machine readable or printed.
4. Most of the content of the CD is provided by members who act without payment. There is no formal contract between the publisher and the originators of the material. If you wish to reproduce any item (except as in clause 2 above) you will, therefore, need to seek permission from the originator and the British Lichen Society.

You will need a computer which can run a CD-Rom, and a browser. Different computer systems use different browsers to interpret the HTML code in which this CD is written. This program has been tested satisfactorily on Netscape (Mozilla) and Internet Explorer on both the the PC and Mac platforms.

Browsers are being constantly developed. Updates are readily available via the Internet or on CDs that come with many computer magazines. A browser, siutable for Acorn computers only, is available from the British Lichen Society.

The speed at which a program will run depends, not only on the browser, but also on computer hardware. You should seek advice from your computer agent, not from the BLS, if operating speeds seem slow or if you encounter other computer problems. If your computer has sufficient capacity you may wish to copy the 26 Mb CD onto the hard disc from which it may run faster.

Simply double-click on INDEX/HTM. Thereafter a single click on any blue word or number (if that is the 'link colour' which has been set on your browser) will take you straight there.

The first page of each species includes results of Pd, K, KC and C chemical spot tests and UV response as well as small images and a map (the 'thumbnails') giving a general indication of where each species is found. A single click on the images will produce a larger version with descriptive notes and a click on the map will reveal larger map enabling occurrence (or not) in a 10 km. square to be noted. From these subsequent pages you may return to the first page of each species, (which shows the image and map thumbnails), by single-clicking the species name. In the Key you may move forward or back by single-clicking the blue numbers.

• The scale bars on each image are intended to give no more than an indication of the degree of magnification.
• The Introduction and Acknowledgements are only accessible from the INDEX.HTM file on each startup (and from each other).
• BLS mapping numbers are given in Current Names and Synonyms and on the first page of each species.
• In Synonyms, the numbers of species for each genus refers to world-wide distribution.
• The choices 'Current names, Synonyms, Key, Habitat List, Chemistry and Glossary' appear at the head and foot of every page.
• The symbols F, O and R in the Habitat Lists do not indicate abundance , only preferences.
• Only the first page of each species shows the full name with authority, results of Pd, K, KC and C chemical spot tests, UV responses and the complete notes from the Atlas fascicles.
• Your use of the CD will imply acceptance of the terms of the Licence.