659 
Macroglossum Alidae, Copeland. 
which are somewhat more conspicuous upon the lower side of the leaf. 
The bundles of the delicate veins approach the collateral form, the small 
group of tracheary tissue being nearer the ventral side of the bundle and 
separated from it by about two layers of cells. 
New leaves are formed in rapid succession. The second or third are 
much like the cotyledon, except that they are slightly larger. These early 
leaves have finely but distinctly serrated margins. The next leaves are 
lanceolate in outline, and in the later leaves the margins are almost entire 
except at the apex, which becomes much attenuated and is coarsely serrate. 
A considerable number, ten or more, of simple leaves are developed before 
Text- fig. 3. A, Section of petiole of cotyledon. x 25. b, Section of lamina of cotyledon, 
x 180. c, Section of tetrarch root, x 50. 
any division of the lamina occurs. These simple leaves are much larger 
than has been observed in Angiopteris , and a greater number are formed. 
In this respect Macroglossum more nearly resembles Danaea , but these 
early leaves are much larger. Indeed, such a plant as that shown in 
PI. XLVIII, Fig. A, much resembles the adult plant of D. simplicifolia. All 
of the early leaves have a conspicuous midrib from which the lateral veins 
extend. These veins usually fork close to the midrib, and the branches may 
extend to the margin, or they may fork once more. As in Angiopteris and 
Marattia , the first two leaves are destitute of stipules, which are first 
developed in the third leaf (PI. XLVI, Figs. 8, 9). For a time, at least, 
a root is formed corresponding to each leaf, but whether this holds for the 
old sporophyte was not investigated. 
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