DIY History | Transcribe | Scholarship at Iowa | A brief description of nine species of Hepaticae found in the vicinity of Iowa City by Mary F. Linder, 1886 | A brief description of nine species of Hepaticae found in the vicinity of Iowa City by Mary F. Linder, 1886, Page 23

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A brief description of nine species of Hepaticae found in the vicinity of Iowa City by Mary F. Linder, 1886

A brief description of nine species of Hepaticae found in the vicinity of Iowa City by Mary F. Linder, 1886, Page 23

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[page]21.[/page] 13807 -sists of a single layer of tabular cells, which arches over the air cavities found in the layer of tissue beneath it and is marked by reticulating grooves into distinct more or less diamond shaped areas. Each area, PL.IV. fig. 2.a, corresponds to an air cavity beneath and usually has a stoma developed near the center. Each stoma has its origin in a single cell which divides into four to six radiating daughter cells, and these by their lateral growth separate sufficiently to form a pore in the center of the group, thus opening a passage from the air cavities of the thallus to the external air. Afterwards a horizontal division takes place, giving rise to several superimposed circular rows of cells, PL.V. fig. 1. E. The lowest ring of cells is sometimes