Equisetum laevigatum and Its near Relatives

Abstract

Owing to almost continuous rain during the three or four days I spent on the mountain, only a very inadequate exploration of this interesting locality was possible, and I am unable to say at present whether either of these ferns are more widely distributed there, but it is quite probable that they may be found elsewhere in similar situations. Other ferns noted on Magazine Mountain were Botrychium virginianum, Polypodium polypodioides, Phegopteris hexagonoptera, Adiantum pedatum, Pteridium aquilinum var. pseudocaudatum, Cheilanthes lanosa, C. tomentosa, Asplenium platyneuron, Polystichum acrostichoides, Thelypteris marginalis, Cystopteris fragilis and Woodsia obtusa. The two species which are the subject of this sketch were collected under the following serial numbers: Woodsia scopulina, No. 24147, Oct. 15, 1923; Dennstaedtia punctilobula, No. 24125, Oct. 14, 1923. Duplicates of both may be found in the National Herbarium, Gray Herbarium, and the herbaria of the Missouri Botanical Garden and the University of Arkansas. I am under obligations to Mr. Weatherby and Dr. Maxon for confirming determinations of these interesting ferns, and for information in regard to their range, and to Mr. B. F. Bush for records of Dennstaedtia punctilobula in Missouri, where it has been reported from Scotland, Madison and Ste. Genevieve Counties. ARNOLD ARBORETUM