His interests also extended to collecting fungi and other cryptogams. Antheridia are present in the gametophyte phase of cryptogams like bryophytes and ferns. With some of the cryptogams he had been helped by Dillenius. He is known for his particular observations of sexual reproduction in the cryptogams. The first period was characterized by cryptogams. He discovered the study of cryptogams and mushrooms as a volunteer at the botanical garden. He enthusiastically collected plants of all kinds, especially cryptogams, primarily in the Malchin area. She studied plants, specialising in the Cryptogams such as mosses, liverworts, lichen, and seaweeds. At one time, the cryptogams were formally recognised as a group within the plant kingdom.