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Full-Text Articles in Life Sciences
Scirpus Validus And S. Acutus: A Question Of Distinctness, Marlyn Miller, E. O. Beal
Scirpus Validus And S. Acutus: A Question Of Distinctness, Marlyn Miller, E. O. Beal
Journal of the Minnesota Academy of Science
An analysis of 32 populations of bulrushes in the Scirpus validus-acutus complex growing in Itasca State Park and prairie ponds to the west indicates that most of the populations are referable to neither S. validus nor S. acutus but, rather, are intermediate in morphology. Further, the supposedly characteristic features by which the two nomenclatural species have been identified are erratically correlated.
A Computer Analysis Of Relationships Between Orders Of Chrysophyta, David P. Olds
A Computer Analysis Of Relationships Between Orders Of Chrysophyta, David P. Olds
Journal of the Minnesota Academy of Science
The division Chrysophyta has previously been formulated to include three diverse groups. A computer analysis was made of the individual orders within the division to determine the "naturalness" of this grouping and also to show how computer techniques may be used for this purpose. The computer methods are described, and a possible system of classification of the division based on the computer analysis is presented.
Size-Structure Correlation In Developing Roots Of Cissus And Syngonium, David L. Berquam
Size-Structure Correlation In Developing Roots Of Cissus And Syngonium, David L. Berquam
Journal of the Minnesota Academy of Science
The development of conducting tissues in relation to root size is examined in Cissus sicyoides L. and Syngonium podophyllum Engl. Evidence is presented that such relationships arise earlier in development than has hitherto been described. Their early appearance calls into question the hypothesis that such relationships reflect a solution to problems of water economy in mature tissues. While pattern determination in Syngonium is similar to that anticipated on the basis of published investigations, a new 'kind of size-structure correlation is identified in Cissus. In light of this fact, a need to broaden the philosophical bases for an interpretation of form …
Deciduous Trees Of Minnesota: A Winter Key, Thomas Morley
Deciduous Trees Of Minnesota: A Winter Key, Thomas Morley
Journal of the Minnesota Academy of Science
Keys are provided for the identification in winter condition of Minnesota's native deciduous trees and also those commonly cultivated. A labelled plate of illustrations accompanies the keys, as does a brief selected reference list.
Pine Reproduction In Itasca State Park: Analysis In Moisture-Nutrient Coordinates, Vilis Kurmis, Henry L. Hansen
Pine Reproduction In Itasca State Park: Analysis In Moisture-Nutrient Coordinates, Vilis Kurmis, Henry L. Hansen
Journal of the Minnesota Academy of Science
Natural pine reproduction was studied in 36 forest communities representing the range of ecological variability of the upland forest in Itasca Park, Minnesota. The method of synecological coordinates was used to evaluate reproduction in relation to stand and site conditions. In the absence of fire, predominantly medium to nutrient-rich forest soils favor the growth of herbs, shrubs, and hardwoods under the open canopies of pine and aspen stands. There are very few red pine (Pinus resinosa Ait.) and jack pine (Pinus banksiana Lamb.) seedlings under these conditions, and growth of white pine (Pinus strobus L.) seedlings is severely restricted.
Sex Induction In Equisetum Arvense L., Stephen Davis
Sex Induction In Equisetum Arvense L., Stephen Davis
Journal of the Minnesota Academy of Science
Equisetum arvense was studied for sexual development. The effects of crowding and transplantation were observed to influence sexual maturity and growth patterns of the gametophytes. Regeneration experiments demonstrated that sexual development is environmentally induced.