This 2nd edition provides, a.o., new (or partly new) keys for Conocephalum, Fossombronia, Herbertus, Lepidozia, Lophozia, Plagiochila, Riccia, Scapania, Telaranea, etc., numerous new keys for subspecies or varieties, updated distribution data, many corrections to patronyms, an impressive number (ca. 400!) of new synonyms in the corpus as in the index and many new useful references to literature and illustrations until August 2005.