Underwood: American ferns 603 



3. A single specimen from Potrero, Mexico, Hahn 56, in herb. 



Paris, indicates a species distinct from any known. The pinnae 

 are 9 by 2.5 cm., with prominent veins, while the sporophyllary 

 pinnae are narrowly linear, 13 cm. long by 3 mm. wide. The 

 specimens Were distributed as 5. erythrodes but of course have 

 nothing to do with that South Brazilian species. Potrero is in the 

 state of Hidalgo. 



4. Two specimens in herb. Berol. : Bahia, LucJinath 86 y and 

 Sellow (without locality), were marked by Klotzsch as a new 

 species in Olfersia but apparently have not been described. They 

 represent a species of Stenochlaena which recalls 6*. Maxoni as 

 described above, but have marked differences. The pinnae are 

 acute at base but are sessile, 1 1— 12 by 2 cm., tapering to an acu- 

 minate point; the sporophyllary pinnae are 6—7.5 cm - ^ on S ^Y 4 

 mm. wide and also sessile. The two specimens are not quite 

 counterparts of each other, the Luchnath specimen having the 

 sporophyllary pinnae up to 9 cm. long. They probably represent 

 a good species which had best await further exploration in the little- 

 known regions of Brazil. 



5. A second specimen from Brazil, collected by Sellow, also in 

 herb. Berol., bears a second unpublished name by Klotzsch under 

 Olfersia. It has pinnae rounded at the sessile base, 17 by 2.5 

 cm., tapering gradually to the apex ; the sporophyllary pinnae are 

 10 cm. long by 6 mm. wide ; the veins are close, 12 or more inter- 

 costal spaces to I cm. This plant is not like any described species 

 and is probably new, as indicated in Klotzsch's herbarium name. 



The genus Olfersia, containing the common Olfersia cervina of 

 the American tropics and a second Brazilian species which is the 

 type of the genus (O. corcovadensis), is characterized by its distinct 

 marginal vein with which the other veins unite ; its sporophyls are 

 similar to those of Polybotrya but simpler. It is not a near ally of 

 Stenochlaena. 



B. The status of Poecilopteris crenata Presl 



The genus Leptochilus was founded by Kaulfuss in 1824, based 

 on Acrostichum axillare Cav. This long-known plant possesses a 

 simple leaf with the complex venation of Drynaria, Tcctaria, and 

 Phymatodes. Whether all the species with this type of anas- 



