. Studies in fossil botany . Paleobotany. STAUROPTERIS 339 homosporous sporangia or microsporangia. A year previously a case had been observed in which spores were found germinating inside an isolated sporangium, the stages agreeing with those found in recent Subsequently, similar stages of germination were de- tected in typical sporangia of Stauropteris oldhamia, establishing a strong presumption that this plant also was a true homosporous Some of the germinat-. Fig. 128.—Stauropteris oldhamia. Four germinating spores from the interior of a sporangium. All four are putting out
. Studies in fossil botany . Paleobotany. STAUROPTERIS 339 homosporous sporangia or microsporangia. A year previously a case had been observed in which spores were found germinating inside an isolated sporangium, the stages agreeing with those found in recent Subsequently, similar stages of germination were de- tected in typical sporangia of Stauropteris oldhamia, establishing a strong presumption that this plant also was a true homosporous Some of the germinat-. Fig. 128.—Stauropteris oldhamia. Four germinating spores from the interior of a sporangium. All four are putting out rhizoids. In C (lying horizontally) an addi- tional cell has been cut off between rhizoid and spore. X 335. S. Coll. 2215. Drawn by Mr. L. A. Boodle. ing spores are shown in Fig. 128. All four have sent out rhizoids, cut off by a wall from the body of the spore, and in C another cell has been cut off above the rhizoid. In the light of these observations there is no longer any reason to doubt that Stauropteris was 1 Scott, "Germinating Spores in a Fossil Fern-Sporangium," New Phytologist, vol. iii. 1904. 2 Scott, "The Occurrence of Germinating Spores in Stauropteris oldhamia," New Phytologist, vol. v. 1906. I am indebted to my wife, Mrs. D. H. Scott, F. L. S., for much help in these 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 Scott, Dukinfield Henry, 1854-1934. London, A. and C. Black
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