| GROUP I | STERILE AND FERTILE FRONDS TOTALLY UNLIKE; |
wither, and, during the summer, may be found either clinging to the stalks of the sterile fronds or lying on the ground.
The Cinnamon Fern is often confused with the Ostrich Fern. When either plant is in fruit there is no excuse for this mistake, as the cinnamon-colored spore-cases of the former appear in May, while the dark-green fertile fronds of the latter do not ripen till July. When the fruiting fronds are absent the forked veinlets (Plate III, a) of the Cinnamon Fern contrast with the simple veinlets of the other plant (Plate II, a). Then, too, the pinnæ of the Cinnamon Fern bear tufts of rusty wool at the base beneath, the remnants of the woolly garments worn by the young fronds.
The plant is a superb one when seen at its best. Its tall sterile fronds curve gracefully outward, while the slender fruit-clusters erect themselves in the centre of the rich crown. In unfavorable conditions, when growing in dry meadows, for instance, like all the Osmundas, and indeed like most growing things, it is quite a different plant. Its green fronds become stiff and stunted, losing all their graceful curves, and its fruit-clusters huddle among them as if anxious to keep out of sight.
Var. frondosa is an occasional form in which some of the fruiting fronds have green, leaf-like pinnæ below. These abnormal fronds are most abundant on land which has been burned over.
The Cinnamon Fern is a member of the group of Osmundas, or "flowering ferns," as they are sometimes called, not of course because they really flower,
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