THE FERN BULLETIN 



67 



and sterile groups alternating". In most dimorphic 

 species, this seasonal difference is more strongly mark- 

 ed because of the difference that also exists in the form 

 of the two kinds of fronds. 



NOTES ON AMERICAN FERNS: VIII * 



By William R. Max on. 



Another Alabama Station for Trichomanes 

 Petersii. — At page 84 of volume VIII of the Fern 

 Bulletin I published in 11)00 a brief account of the 

 known localities for Trichomanes Petersii in Alabama, 

 particularly of those in Winston and Etowah Counties, 

 and made mention of its reported occurrence in the 

 "rock houses'' at Pikeville, Marion County. Speci- 

 mens collected during the summer of 1909 by Prof. H. 

 H. Smith are now at hand from an additional locality 

 in Marion County. These are from the gorge of the 

 Bullahatchee River, 2 miles east of Hamilton, and oc- 

 cur closely imbricated into a dense mat which is said 

 by the collector to have covered a large rock in talus 

 at the foot of a cliff. They are perfectly characteris- 

 tic of the species, and among them are many fertile 

 fronds. Professor Smith writes that in his search for 

 land shells he made no particular effort to secure ferns 

 and may easily have overlooked the species in other 

 localities. He adds: "The places to look for it would 

 be the deep 'coves' of the Cumberland plateau of north- 

 ern Alabama; also the coves of Sand Mountain." 

 There is, of course, every reason to suppose that it is 

 not uncommon in that general region, as was suggest- 

 ed in 1900. Since that time it has been collected near 

 Saratoga, Mississippi, by Prof. S. M. Tracy, and near 

 Tallulah Falls, Georgia, by Mr. A. B. Seymour. (See 



* Published by permission of the Secretary of the Smithsonian Institution. 



