Microsporogenesis and Embryogeny in Certain Species of Bromus

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Abstract
Material of B. villosus Forsk, .B. marginatus Nees, and B. rubens L. was fixed in Carnoy''s reagent, imbedded in nitrocellulose, and sectioned on a Thompson Jeffrey sliding microtome. Serial sections in paraffin were also used. B. marginatus and B. rubens were octoploid and tetraploid respectively, while B. villosus was variable between octoploid and decaploid. Megasporogenesis and embryo sac development appeared to be rather typical for the Gramineae. The antipodals, 5-8 in number, were large, existing considerably longer than smaller cells. Poly-ploidy together with irregularities in the movements of the chromosomes and the extrusion of chromatin material indicate the possibility of hybridization.