. Dudley memorial volume, containing a paper by William Russel Dudley and appreciations and contributions in his memory by friends and colleagues ... Dudley, William Russel, 1849-1911; Botany. 46 DUDLEY MEMORIAL VOLUME They are usually not branched but may be forked once (Fig. 1, C). There is a deep sinus in front within which lies the growing point of the thallus. A thick midrib is developed strongly, projecting on the lower side where its ventral surface is covered with numerous deep purple-red rhizoids. The margin of the thallus is more or less strongly undulate and folded, but these undula
. Dudley memorial volume, containing a paper by William Russel Dudley and appreciations and contributions in his memory by friends and colleagues ... Dudley, William Russel, 1849-1911; Botany. 46 DUDLEY MEMORIAL VOLUME They are usually not branched but may be forked once (Fig. 1, C). There is a deep sinus in front within which lies the growing point of the thallus. A thick midrib is developed strongly, projecting on the lower side where its ventral surface is covered with numerous deep purple-red rhizoids. The margin of the thallus is more or less strongly undulate and folded, but these undulations are hardly distinct enough to be called leaves. The whole aspect of the plant is very much like certain species of Pallavicinia, and also suggests the Japanese genus Makinoa.* A section of the thallus (Fig. 3, A) shows that the midrib comprises about a dozen cells in thickness, but there is no trace of the conducting strands of tissue which are a constant character in Pallavicinia. In Eupallavicinia (Blyttia) there is a single very con- spicuous axial strand, while in Morkia, according to Cavers, there are de- veloped two strands which are however much less strongly developed than in Bl)rttia. In the character of the midrib, therefore, Morkia seems to be somewhat intermediate in character between Ccdycularia radiculosa and Blyttia. The wings of the thallus are composed of a single layer of cells in the marginal region, but toward the midrib the wings are composed of two or. Fig. 4. A, vertical section of the thallus apex, in which there are dorsal and ventral segments cut off from the apical cell. B, C, two consecutive sections from a thallus apex, in which a single basal segment is cut off. D, E, two nearly horizontal sections, showing the appearance of the apical cell, x, when seen from above, x 225, h, ventral glandular hairs. * Miyake, K.; Makinoa, A New Genus of Hepaticae. Bot. Mag., Vol. 13, Please note that these images are extracted from scanned page images
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
