34 Karl M. Wiegand and Arthur J. Eames 



1. O. regalis L., var. spectabilis (Willd.) Gray. (See Rhodora 21:176. 1919.) 



Flowering Fern. Royal Fern. 



Mucky borders of swamps, in acid soil though in both acid and somewhat cal- 

 careous regions ; frequent. May 20-June. 



Pond near Enfield Falls; s. of Caroline Depot; n. w. of Brookton; South Hill 

 Marsh; Renwick Marshes (D. in C. U. Herb. !) ; Warren woodlot n. of Forest Home; 

 Ellis Hollow ; Mallory ville Bog ; McLean Bogs ; Lake Como ; n. of Montezuma vil- 

 lage ; Montezuma Marshes ; Junius ponds ; Featherbed Bog. 



Newf. to Sask., southw. to Fla., Miss., and Nebr., including the Coastal Plain. 

 Found also in tropical Am. 



2. O. Claytoniana L. Interrupted Fern. 



In damp fields or woods, in rich, often alluvial, neutral or somewhat acid, soils ; 

 frequent, especially on the hills s. of Ithaca. May 20-June 20. 



North Spencer ; Michigan Hollow ; Inlet Valley, Newfield ; Enfield Glen ; Fall 

 Creek (D. in C. U. Herb.), above Forest Home; Turkey Hill; Mud Creek, Freeville; 

 McLean Bogs ; Beaver Brook ; and elsewhere. 



Newf. to Minn., southw. to N. C, Ky., and Mo., including the Coastal Plain. 

 Found also in s. Asia. 



3. O. cinnamomea L. Cinnamon Fern. 



Mucky swamps, in acid soils, most abundant about peat bogs ; common in such 

 situations. May 20-June. 



Newf. to Minn., southw. to Fla., La., and N. Mex., including the Coastal Plain. 

 Found also in Mex., S. A., W. I., and Eurasia. 



Sterile fronds of Osmunda Claytoniana and O. cinnamomea resemble those of 

 Woodwardia and Thelypteris (see Woodwardia) . These species of Osmunda may 

 be distinguished from the species of Thelypteris which they resemble, by the absence 

 of scales on the stipe and by the single large curved bundle in the stipe with inrolled 

 edges. Sterile fronds of O. cinnamomea have tufts of wool at the base of the pinnae 

 and the stipe is 2-ridged throughout. In 0. Claytoniana the wool is absent and 

 the stipe is ridged only toward the summit. 



3. SALVINIACEAE (Salvinia Family) 

 1. Azolla Lam. 

 1. A. caroliniana Willd. 

 Quiet waters ; very rare. 



"Cayuga Marshes, at the foot of Cayuga Lake," 1879 (D. in C. U. Herb.) ; not 

 seen in recent years. 

 Ont. and Mass. (?) to B. C, southw. to Fla. and Mex. Found also in tropical Am. 



4. MARSILEACEAE (Water Clover Family) 

 1. Marsilea L. 



1. M. QUADRIFOLIA L. WATER CLOVER. PePPERWORT. 



Slow-flowing, calcareous or neutral, waters ; locally abundant. Sept.-Nov. 



Eddy Pond, formerly (site of the Girls' Playground, Cascadilla Glen) ; in Fall 

 Creek, near its mouth and along Renwick Beach ; also on various points along the 

 lake shore to Union Springs. Said to have been introduced by the early local 

 botanists. 



Native of Eurasia. 



