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AMERICAN JOURNAL OF BOTANY 
[Vol. 8 
and through his courtesy the writer has been able to examine a large number 
of preparations made by Dr. Lyon, as well as to make a series of slides from 
gametophytes and sporophytes furnished by him. 
Fig. 4. Median longitudinal section of a young sporophyte of Botrychium oUiquum, 
showing the continuity of the steles of the cotyledon and root, and the junction of the two 
leaf-traces at the base of the root. Photograph by Dr. H. L. Lyon. 
In B. obliquum (fig. 4), there is a conspicuous suspensor, comparable^to 
that in Danaea^* and Macroglossum.^^ Moreover, the young sporophyte is 
bipolar in structure, and the relation of cotyledon and root is essentially 
the same as in Ophioglossum Moluccanum. As in the latter, the primary root 
of Botrychium obliquum is endogenous in origin, instead of being superficial 
as it is in B, Virginianum. It grows downward through the foot, exactly 
^4 Campbell. The Eusporangiatae. 
Campbell, D. H. The structure and affinities of Macroglossum Alidae, Copeland. 
Annals of Bot. 28: 651-669. 1914. 
