Elementary botany . Fig. 308. 1 Archegonium of fern. Large cell in the longer venter is the egg, next is the ventral canal _ cell, and in the canal of the neck are two StOUt projections from the Surface nuclei of the canal cell. gf the prothallium. These are shown in fig. 297. They are 268 MORPHOLOGY. the archegonia. One of them in longisection is shown in It is flask-shaped, and the broader portion is sunk in the. Fig. and open archegonium of fern (Adiantum cuneatum) with spermatozoids makingtheir way down through the slime to the egg. tissue of the prothallium. The egg is


Elementary botany . Fig. 308. 1 Archegonium of fern. Large cell in the longer venter is the egg, next is the ventral canal _ cell, and in the canal of the neck are two StOUt projections from the Surface nuclei of the canal cell. gf the prothallium. These are shown in fig. 297. They are 268 MORPHOLOGY. the archegonia. One of them in longisection is shown in It is flask-shaped, and the broader portion is sunk in the. Fig. and open archegonium of fern (Adiantum cuneatum) with spermatozoids makingtheir way down through the slime to the egg. tissue of the prothallium. The egg is in the larger part. Thespermatozoids when they are swimmingaround over the under surface of the pro-thallium come near the neck, and here theyare caught in the viscid substance whichhas oozed out of the canal of the arche-gonium. From here they slowly swimdown the canal, and finally one sinks intothe egg, fuses with the nucleus of the latter,and the egg is then fertilized. It is nowready to grow and develop into the fernplant. This brings us back to the sporo- phyte, which begins with the fertilized egg.


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