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The Bell Natural History Museum, An Aid To Teaching Botany, Harold W. Hansen
The Bell Natural History Museum, An Aid To Teaching Botany, Harold W. Hansen
Journal of the Minnesota Academy of Science
Much of the regular academic year does not lend itself to observation of plants in their natural habitat outdoors. The museum exhibits can serve as study aids in the off season, although they should not be utilized as substitutes for field work. This study systematized some materials available for class use. Museum files, display legends, and original observations were used. From the Bell Museum of Natural History, 112 exhibits were listed and coded for location; 384 specimens, of 247 species were listed from individual displays; a massed alphabetized species index was prepared. The exhibit "Maple-Basswood Forest" was studied in detail; …
Lichen Studies On Allison Savanna, Clifford Wetmore
Lichen Studies On Allison Savanna, Clifford Wetmore
Journal of the Minnesota Academy of Science
Soil and tree lichens were studied on the Helen Allison Savanna in Anoka County, Minnesota. Sample plots established in parts of the savanna have had fires at various time frequencies, and one section has had no recent fires. Fire has not eliminated any lichen species on the trees but has reduced their frequency in the lower trunk plots. Most soil species of lichens are eliminated by even infrequent fires. Fifty two species were found on trees and 13 species on the soil.
Composition Of Goldenrod (Solidago: Compositae) Populations By Species In The Upper Midwest, William E. Miller
Composition Of Goldenrod (Solidago: Compositae) Populations By Species In The Upper Midwest, William E. Miller
Journal of the Minnesota Academy of Science
In each of 100 abandoned agricultural fields grown over with goldenrod, stems were diagnosed and counted in 20 occupied 0.4 M plots selected by hoop tossing. Preliminary results differed little between hoop tossing and random plot selection, and between 0.9 and 0.4 m plot sizes. In rank order of stem abundance the taxa were Solidago altissima L. S. canadensis L. complex S. gigantea Ait. S. graminifolia (L.) Saliab. S. nemoralis Ait. S. ulmifolia muhl. others. An average of 2.2 taxa were recorded per field, and three or more taxa in at least one plot in 34 percent of fields. Where …
Nutritional Preferences Exhibited By Plants In Ad Libitum Feed Systems, L. A. Errede
Nutritional Preferences Exhibited By Plants In Ad Libitum Feed Systems, L. A. Errede
Journal of the Minnesota Academy of Science
Ad libitum feeding plant systems fitted with two reservoirs were used to monitor daily aqueous uptake by plants from paired reservoirs. When the reservoirs contained aqueous solutions of the same chemical composition, a plant accepted nourishment from alternate sources without bias; but when the reservoirs contained different aqueous solutions, i.e. either tap water or standard nutrient solution, a sharp bias was exhibited, depending on the plant's need for mineral nutrient, which changed with time. Eventually a "stable-end-state" was attained, favoring water over the standard nutrient solution in the ratio of 3 to 1. When the plant was pruned severely, however, …
Scaled Chrysophycae From Lake Itasca Region I. Mallomonas, Daniel E. Wujek, Michael M. Weis, Robert A. Anderson
Scaled Chrysophycae From Lake Itasca Region I. Mallomonas, Daniel E. Wujek, Michael M. Weis, Robert A. Anderson
Journal of the Minnesota Academy of Science
By means of electron microscopy, phytoplankton samples from the Lake Itasca region were examined for the silica-scaled chrysophycean genus Mallomonas. Seventeen taxa were observed: 15 are new for Minnesota, of these 15, seven are also new reports for the continental United States.
Initiation And Early Development Of Axillary Buds In Cyclamen, Marshall D. Sundberg
Initiation And Early Development Of Axillary Buds In Cyclamen, Marshall D. Sundberg
Journal of the Minnesota Academy of Science
The development of axillary buds along the primary shoot axis of Cyclamen persicum Mill. F-1 Rosemunde .was examined. Vegetative buds usually formed in the axils of the cotyledon and first 5 leaves. Flowers were produced from the majority of the buds which developed in the axils of later-formed leaves. The first indication of vegetative bud development was the appearance of a shell zone. Proliferation of the cells set off by this zone soon led to the establishment of a branch shoot apex producing leaf primordia. Formation of a shell zone was not associated with the initiation of floral buds. These …