Henssen, A 1970: Die Apothecienentwicklung bei Umbilicaria Hoffm. emend Frey. - Vortrage aus dem Gesamtgebiet der Botanik, N.F. [Deutsch. Bot. Ges.]4: 103-126. [RLL List # 75 / Rec.# 8324] Keywords: APOTHECIAL DEVELOPMENT/ UMBILICARIA/ ASCOCARPS/ SYSTEMATICS/ LASALLIA/ AGYROPHORA/ ACTINOGYRA/ OMPHALODISCUS
Abstract: 9 fig. 4 pl. ["A detailed study of the ascocarp ontogeny in species ... in the genera Agyrophora, Omphalodiscus, Umbilicaria, Actinogyra and Lasallia revealed a great correspondence in the steps of development.... A classification based only on the apothecium morphology, therefore, leads to unnatural groups." -- English summary.]