A.  Henssen, ?An interesting new species of Lempholemma from Canada?, Lichenologist, vol. 4, pp. 99-104, 1969.

A.  Henssen, ?Three non-marine species of the genus Lichina?, Lichenologist, vol. 4, pp. 88-98, 1969.

A.  Henssen, ?The Genus Zahlbrucknerella?, The Lichenologist, vol. 9, pp. 17-46, 1977.

A.  Henssen, ?New or interesting cyanophilic lichens II.?, The Lichenologist, vol. 6, pp. 106-111, 1974.

A.  Henssen, ?New or interesting cyanophilic lichens II.?, The Lichenologist, vol. 6, pp. 106-111, 1974.

A.  Henssen, ?New or Interesting Cyanophilic Lichens I.?, Lichenologist, vol. 5, pp. 444-451, 1973.

A.  Henssen, ?Edwardiella mirabilis, a holocarpous lichen from Marion Island?, the Lichenologist, vol. 18, pp. 51-56, 1986.

A.  Henssen, ?A new Zahlbrucknerella species from the subantarctic?, The Lichenologist, vol. 17, pp. 301-303, 1985.

A.  Henssen, Büdel, B., and Nash, III, T. H., ?Three New Species of Lichinella Described from Mexico?, The Bryologist, vol. 88, pp. 285-292, 1985.

A.  Henssen and Jørgensen, P. Magnus, ?New combinations and synonyms in the Lichinaceae?, The Lichenologist, vol. 22, pp. 137-147, 1990.

A.  Henssen, ?Thermutopsis jamesii L., a new member to the Lichinaceae from Antigua?, The Lichenologist, vol. 22, pp. 253-259, 1990.

M.  Tretiach and Henssen, A., ?Paulia caespitosa sp. nov and P. wrightii comb. nov (Lichinaceae, Ascomycotina)?, Mycotaxon, vol. 57, pp. 359-369, 1996.

A.  Henssen, ?The New Lichen Family Gloeoheppiaceae and its Genera Gloeoheppia, Pseudopeltula  and Gudelia  (Lichinales)?, The Lichenologist, vol. 27, pp. 261-290, 1995.