Abstract
Abstract Five new species of green microalgae are described from axenic cultures isolated from the surface millimetre of a Schumacher silt loam in Whitman County, Washington, U.S.A. They are as follows: Order Chlorococcales—Characium astipitatum sp. nov. (BM-105), Chlorococcum pseudodictyosphaerium sp. nov. (BM-104), Dictyococcus schumacherensis sp. nov. (BM-126). Order Chlorosarcinales—Chlorosarcinopsis amylophila sp. nov. (BM-141). Order Chaetophorales—Pleurastrum pholoheterotrophicum sp. nov. (BM-172). Supplementary characteristics are quantified in addition to traditional morphological descriptions. The properties included are form and colour of the plant-mass, differential utilization of nitrogen and carbon sources, growth in complex bacteriological media, production of extracellular enzymes, and tolerance to antibiotics and crystal violet.
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