English: Vertical section of thallus and apothecium from the foliose lichen Solorina crocea; top layer is hymenium with brownish asci (containing spores); green layer is green algae; bottom orange layer is the medulla.
See below. Cole died in 1900, and so this image is public domain in the UK, where the copyright term is the author's life plus 70 years. If Cole was not the author of the image, the author is unknown, and the image would be public domain in the UK as a photograph of unkown authorship published more than 70 years ago.
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Section of thallus and apothecium from ''Solorina saccata''
Uploaded a work by Illustrator not credited in image. from Cole, Arthur C., ed. (1884). "Structure of the apothecium in Solorina". Studies in Microscopical Science. section1 plate 4. https://www.google.ca/books/edition/Studies_in_Microscopical_Science/v8TvAAAAMAAJ?hl=en&gbpv=1 with UploadWizard