. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. wm 76 American Fern Journal 2. Wrinkles of perispore not forming continuous ridges or wings (3). 3. Spores light brown or yellowish-brown. Dryopteria (Phegopteris group) ?Spores light greenish-brown, to 60 mu long D. Phegopteris (L.) C. Chr. Spores greenish-brown, 20-27 X 30-50 mu. D. hexagonoptera (Mx.) C. Chr. Spores light brown, 15-22 X 25-39 mu. D. Linnaeana C. Chr. 3. Spores dark brown; protuberances large, smooth, close together; spores 20-27 X 30- 39 mu. Dryopteria marginalia (L.) A. Gray. 2. Wrinkles of perispore f
. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. wm 76 American Fern Journal 2. Wrinkles of perispore not forming continuous ridges or wings (3). 3. Spores light brown or yellowish-brown. Dryopteria (Phegopteris group) ?Spores light greenish-brown, to 60 mu long D. Phegopteris (L.) C. Chr. Spores greenish-brown, 20-27 X 30-50 mu. D. hexagonoptera (Mx.) C. Chr. Spores light brown, 15-22 X 25-39 mu. D. Linnaeana C. Chr. 3. Spores dark brown; protuberances large, smooth, close together; spores 20-27 X 30- 39 mu. Dryopteria marginalia (L.) A. Gray. 2. Wrinkles of perispore forming what appear to be more or less continuous ridges or wings (4). 4. Spores nigrescent, angular, wrinkled in ap- pearance rather than with a wide wing. Average, 24 X 29 mu. Athyrium aaplenioidea (Mx.) Desv. 4. Spores light or dark brown (5). 5. Folds of perispore forming a wide, con- spicuous wing completely around the spore, or nearly so (6). 6. Spores brown, 25-30 X 27-35 mu. Camptosorus rhizophyllua (L.) Link. 6. Spores dark brown, usually opaque, with heavy, thick fringes; 35-45 X 45-60 mu. Pteretia noduloaa (Mx.) Nieuwl. 6. Spores brown or light brown; ridges sometimes not wholly continuous. Woodaia. Spores brown, 35-40 X 40-50 mu. W. glabella R. Br. Spores light brown, 35 X 50 mu. W. ohtuaa (Spreng.) Torr. Spores light brown, 30 X 50 mu. W. ilvenaia (L.) R. Br. For distinguishing characters, see Figs. 37-39. 5. Folds of perispore forming broken or nar- row ridges or wings about the spore (7). 7. Ridges showing a tendency to anasto- mose ; thin rather than rounded or obtuse. Spores brown, 30 X 35-45 mu. Athyrium acroatichoidea (Sw.) Diels. Spores brown, 22-23 X 27-40 mu. Athyrium pycnocarpon (Spreng.) Tidestrom. Aaplenium is also to be sought here. Spores brown, 30-40 X 35-55 mu. A. Rutormuraria L. Spores brown, 30-40 X 35-45 mu. A. platyneuron (L.) Oakes. The spore of A. Trichomanea L. is practically identical with that of A. platyneuron; that of A. montanum Willd. is
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