Aino Marjatta Henssen (12 April 1925, Elberfeld – 29 August 2011, Marburg[1]), was a German lichenologist and systematist.
[3] Henssen made many advancements to the taxonomic knowledge of cyanolichens and wrote a textbook on the subject.
She later focused on actinomycetes during her postdoctoral at the Institute for Bacteriology in Berlin, leading to the discovery of two new genera, Pseudonocardia and Thermomonospora.
Over the years, Henssen published many scientific articles on topics relating to lichens, fungi and the systematics of these groups.
[5] She has been credited for having introduced the term pycnoascocarp in a 1963 publication, referring to a specific type of fruiting body characteristic of the family Lichinaceae.