. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 253 The spore-producing hyphae in the young aecidia form a rather loose stratum of somewhat elongated cells (Fig. 162, A, i). These cells divide, forming an upper series of cells which are smaller and narrower than the lower or basal cells. These upper cells are sterile, ultimately disappearing, and they have been compared. Fig. 162A. Spore formation in a cluster cup: I, appearance of the hyphae in a young cup. 2, one of the cells from Fig. i, after it has divided into- the sterile cell and the large basal cell. 3, early stage i
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 253 The spore-producing hyphae in the young aecidia form a rather loose stratum of somewhat elongated cells (Fig. 162, A, i). These cells divide, forming an upper series of cells which are smaller and narrower than the lower or basal cells. These upper cells are sterile, ultimately disappearing, and they have been compared. Fig. 162A. Spore formation in a cluster cup: I, appearance of the hyphae in a young cup. 2, one of the cells from Fig. i, after it has divided into- the sterile cell and the large basal cell. 3, early stage in the fusion of the basal cells of two adjacent hyphae. 4, the two nuclei of the fused cells have divided and two of them are passing to the base of the cells and two into the fused region of the cells. 5, the upper portion of the fused area is cut off, forming the spore mother cell. This cell will divide once, forming a spore and a small sterile cell. 6, a chain of spores and sterile cells is being formed as noted in 5.—^After Christman. to remnants of the tubular outgrowth of the female gametangium noted in the red algae. The basal cells enlarge, become inclined towards one another in pairs and finally meet at their upper ends, the walls dissolving at the point of contact. The nuclei of the two cells now pass to the fused region of the cells and divide, forming four nuclei. Two of these wander back into the base of their respective cells, while the other two pass to the upper portion of the fused Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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