The World Botanical Associates Web Page
Prepared by Richard W. Spjut
January 2005

Polytrichum pallidisetum

Original sample collected and identified by Richard Spjut. Recollection obtained by Patricia Gilliland under the guidance of Richard Spjut. Both samples from the White Mts. Nat. Forest in New Hampshire. Samples screened for antitumor activity by Dean John Cassady, formerly at Ohio State University.

Polytrichum pallidisetum

Large sample collected for isolation of active antitumor agent, here spread out to dry and hand-cleaned to remove debris and dirt from sample.



  1. Spjut, R. W., M. Suffness, G. M. Cragg, and D. H. Norris. 1986. Mosses, liverworts and hornworts screened for antitumor agents. Economic Botany 40: 310-338.

  2. Spjut, R. W., D. G. I. Kingston and J. M. Cassady. 1992. Systematic Screening of Bryophytes for Antitumor Agents. Tropical Bryology 6: 193-202.

  3. Spjut, R. W.  Original and Re-collections of Polytrichum ohioense and Polytrichum pallidisetum for Antitumor Screening.  Memo dated 16 July 1990.

  4. Cassady, J. M. , W. M. Baird & C-j. Chang. 1990. Natural products as a source of potential chemotherapeutic and chemopreventive agents. J. Nat. Prod. 53: 2341.

  5. Zheng, G.,  D. K. Ho & J. M. Cassady.  1992.  Ohioensins and pallidisetins: novel cytotoxic agents from the moss Polytrichum pallidisetum.  J. Nat. Prod.