Narrow-Leaved Chain-Fern 139 
Venation of sporophylls pinnate, anastomose: paracostal 
areol as in sterile leaves, mostly sending out to margin of blade 
veinlets which either are short with free, almost exsected apices 
or, especially near nodes of pinne, prolonged and form a few 
areole. 
Sori sausage-shaped, linear or the smaller oblong, each borne 
on a veinlet forming the outer edge of a paracostal areole and 
contained in a depression of the leaf: indusia subcoriaceous, at 
first enwrapping sporongia, the free inner margin somewhat 
crenulate. 
Spores ovoid-spherical or obscurely spheroid-tetrahedral, ap- 
parently smooth. 
Habitat. Woodland swamps or damp thickets: usually in 
shade. In plants exposed to the sun the texture of the leaves 
becomes thickened and the venation somewhat obscure. Often 
accompanying Dryopteris simulata. 
Range. Maine to Florida, Louisiana, and Arkansas. Also in 
Michigan. 
Lorinseria areolata. Presl, Epim. Bot. 72. 1849. 
Acrostichum areolatum. Linneus, Sp. Pl. 1069. 1753. 
Woodwardia areolata (L.). Moore, Index Fil. XLV. 1857. 
Woodwardia angustifolia. J. E. Smith, Mem. Acad. Roy. Sci. Turin, 5: 
4II. 1793. 
As elsewhere stated,* the plants of Lorinseria areolata, Onoclea 
sensibilis and Osmundia spectabilis when very young are liable to 
be mistaken for one another, but can be easily identified. L. 
areolata and O. sensibilis are closely allied, but bear only the 
most distant relationship to O. sfectabilis. 
In L. areolata the young leaf-blade is at first roundish-cune- 
* See page 124. 
