The previous page is sending you to https://www.alamy.com/lichens-lichens-structures-peculiar-to-lichens-lecidea-pelobotrya-with-stigonema-or-nostoc-pilophorus-robustus-with-gloeocapsa-stigonema-or-nostoc-137-fig-77-lecanora-gelida-ach-a-lobate-cephalodia-x-11-after-zopf-riddle-has-employed-cephalodia-with-their-enclosed-algae-as-diagnostic-characters-in-the-genus-stereocaulon-when-the-alga-is-stigonema-as-in-v-paschale-etc-the-cephalodia-are-generally-very-conspicuous-grey-in-colour-spherical-wrinkled-or-folded-though-sometimes-black-and-fibrillose-s-denudatum-those-containing-nostoc-are-on-the-contrary-minute-an-image232269773.html.

 If you do not want to visit that page, you can return to the previous page.