GENERA AND SPECIES. 75 
PLATE XXIV. 
CAMPTOSORUS. Link. 
GEN. CHAR.—Fruit-dots oblong or linear, single or in pairs, 
irregularly scattered; indusium attached by one side to the lateral 
veins; veins reticulated. 
This is a very small genus of the group Aspleniez, con- 
sisting only of two species—one found but rarely in Sibe- 
ria, the other in the United States. The Siberian species, 
as well as that indigenous to this country, has the pecu- 
liarity of rooting at the apex, as shown in Plate XXV. 
The fruit-patches are oblong or linear; the veins reticu- 
lated, not free, as in most ferns. The sori are covered 
with a linear indusium, usually connivent or joined together 
in irregular unequal pairs, but sometimes scattered over the 
surface on account of the irregularity of the venation. 
The illustration shows part of the lower half of a frond, 
magnified several times, and also represents the sporange, 
with two spores highly magnified. All the figures given 
in the Plate are from Hooker and Bauer. The irregular 
arrangement of the sori and the peculiar character of the 
veins are brought out prominently, as these are significant 
points. 
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