. The algae. Algae. Fig. io8 Alaria esculenta. A, plant of A. oblonga with sporophylls. B, sporangia and paraphyses ( x 200). C, germling sporophyte ( X 100). D, female gametophyte ( x 80). (A, after Oltmanns; B-D, after Newton.) solid, unbranched stipe which is attached to the substrate by means of small, branched rhizoids. It is naked below with an intercalary growing zone that allows for continual renewal, whilst above the growing region the stipe expands into a flattened rachis which bears each year a fresh crop of marginal rows of sporophylls. The frond finally terminates in an expanded s
. The algae. Algae. Fig. io8 Alaria esculenta. A, plant of A. oblonga with sporophylls. B, sporangia and paraphyses ( x 200). C, germling sporophyte ( X 100). D, female gametophyte ( x 80). (A, after Oltmanns; B-D, after Newton.) solid, unbranched stipe which is attached to the substrate by means of small, branched rhizoids. It is naked below with an intercalary growing zone that allows for continual renewal, whilst above the growing region the stipe expands into a flattened rachis which bears each year a fresh crop of marginal rows of sporophylls. The frond finally terminates in an expanded sterile lamina with a well-marked mid-rib, which is also an annual production. In addition to the intercalary growth there is also a marginal growth that imparts a wavy appearance to the terminal frond. This bears the so-called cryptostomata, although these are barely more than tufts of hairs arising in slight depressions. The sporangia are produced on the lower blades mixed up with unicellular paraphyses. The gameto- phytes are protonemal in form, simple or sparingly branched, the male, as usual, being composed of smaller cells with terminal, intercalary, or lateral antheridia, whilst the oogonia on the female 189. 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 Chapman, V. J. (Valentine Jackson), 1910-. London, Macmillan; New York, St. Martin's Press
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectalgae
