On the evening of Thursday the 19th of December, beginning at 7:30PM, the Philadelphia Botanical Club will have its monthly public meeting, and James Lendemer, from the New York Botanical Garden, will talk about lichens, in a lecture titled ‘The Delmarva Lichen Manual: A New Botanical Resource for the Atlantic Coast’.
For more information, see here: http://darwin.ansp.org/hosted/botany_club/meeting.html
For more about the manual, see here: http://www.torreybotanical.org/publications/memoirs/memoirs-of-the-torrey-botanical-society-volume-28-delmarva-lichens-an-illustrated-manual/
Photographs, by James Lendemer, of the lichens Cladonia subtenuis, Lobaria quercizans, and Parmotrema hypotropum:
Growing History 
Just bought the book for myself for Christmas.