Publication Date


Document Type


First Advisor

Mathers, Carrol K.||Grosklags, James H.||Terwilliger, George L.

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Biological Sciences


Club mosses; Ecology--Illinois


The occurrence for the first time in the state of Illinois of lycopodium obscurum (L.) appears to be direct­ly related to the geological and climatological conditions found in the Castle Rock area. Rock River Valley, Illinois. There also appears to be a correlation between the occurrence in Illinois and three recent spontaneous occurrences in the state of Ohio. The correlating factor is that all of the occurrences are located in a habitat structure dominated by either man-made or naturally disturbed geological features. In the Castle Rock area of Rock River Valley the geo­logical disturbance factor is that of slumping. The slump­ing of the sandy detrital soil coupled with a high water table has produced a microhabitat with a Dfb climate. As to the origin of the plants in the microhabitat one can make the assumption, based on the research of Cobb in Colorado, that the occurrence is the result of high level wind spore dissemination. There also is the possibility that the occurrence may be a pleistocine relict or, perhaps, the work of man.


Includes bibliographical references.||Includes illustrations and maps.


v, 59 pages




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