Urban Lichens: A Field Guide for Northeastern North America By Jessica L. Allen and James C. Lendemer. 2021. Yale University Press, New Haven and London. Pp 158, 121 colour photographs and illustrations. 20.3 x 12.7 cm. ISBN 9780300252996. Flexibound. Widely available, including from www.nhbs.com (£24.99 postage) and www.amazon.com ($19.87 postage)