Currant information on using lichens for fibre art is difficult to find as the availability of the materiel is local.
Ms. Casselman is a well known expert for using leaves ,flowers,roots and bark to obtain colours to dye
wool fleece, yarn and cloth. The section included in her book 'Craft of the Dyer' about lichens is a start
on understanding the techniques required to get colour out of the mysterious growths on rocks and trees,
and this smaller book deepens understanding of our Canadian types.
The written instructions are good. As it is difficult to identify lichens with confidence,I would wish for a better
set of drawings or photographs. Those included on the inside of the cover lack any indication of locale or scale.
My copy is already dog eared as I use it for guidance while processing wool fleece and yarn for rug hooking.