. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. LEPTOSPORANGIATM HETEROSPOREJE 441 seem to be with the Osmundacese, but in the structure and ar- rangement of their vascular bundles they are more like the Gleicheniacese. Of the two families of the Hydropterides, the Salviniacese shows several points of resemblance to the Hymenophyllaceae. The development of the leaves is strikingly like those of Hy- menophyllaceae with reniform or palmate leaves, and the struc- ture of the sori almost identical. The absence of secondary Sifvinio. AzolltK Eus
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. LEPTOSPORANGIATM HETEROSPOREJE 441 seem to be with the Osmundacese, but in the structure and ar- rangement of their vascular bundles they are more like the Gleicheniacese. Of the two families of the Hydropterides, the Salviniacese shows several points of resemblance to the Hymenophyllaceae. The development of the leaves is strikingly like those of Hy- menophyllaceae with reniform or palmate leaves, and the struc- ture of the sori almost identical. The absence of secondary Sifvinio. AzolltK Eusporangiattg roots in Salvinia is suggestive also of the similar absence in some species of Trichomanes. The two-sided apical cell of the stem is, however, different from that ofthe few Hymeno- phyllaceae examined, which all possess the pyramidal initial, but possibly further examination may show forms with an initial cell similar to that of Asolla or Salvinia. The Marsiliaceae, except for their marked heterospory, are typical leptosporangiate forms. The writer has been inclined to assign them a position near the Polypodiacese, but recent. 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 Campbell, Douglas Houghton, 1859-1953. New York, The Macmillan Company;
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