This book is the first guide specifically and entirely dedicated to the study of ascomycetes belonging mainly to the Pezizales, Helotiales and Orbiliales, exploring all aspects of the study of these fungi (life traits, morphology, microscopy, genetics, etc.).
Studying the Discomycetes from initiation to advanced levels by R. Dougoud: https://ascomycete.org/Portals/0/Documents/Book-OrderForm.pdf
Interesting website as well although could do with more pictures to stimulate interest.
There are more photos in this extract https://ascomycete.org/Portals/0/Documents/StudyingDiscomycetes.pdf