494 



FILICES. 



ASPLENIUM. 



Moist shadv woods : common. Fr. July. This species has been referred to Aspidium 

 by nearly all North American botanists, but it is certainly a congener of the preceding ferns, 

 and we think an undoubted Asplenium. Like the European plant, it varies considerably in 

 ihe breadth of the frond and in some other unimportant characters, but is always easily 

 recognized. 



1J. ANTIGRAMMA. Presl ; J. Smith, I. c. no. 72. ANTIGRAMMA. 



[From the Greek, anti, like, and gramma, writing; in allusion to the appearance of the sori.] 

 Asplenii, spp.auct.; Camptosorus, Prcsl. 



Sori linear, unilateral, mostly approximated in pairs and facing each other, scattered. In- 

 volucre linear ; one margin free. — Fronds simple, lanceolate, cordate, entire or sinuate, 

 smooth : veins forked, reticulated ; the marginal veinlets free. 



Differs from Asplenium in its reticulated veins, and in habit. 



1. Antigramma rhizophylla, J. Smith. (Plate CLIX.) Walking-fern. 



Frond lanceolate, somewhat crenate (rarely sinuate), auriculate-cordate at the base ; the 

 point very long and attenuated, often rooting at the extremity. — /. Smith, I. c. Asplenium 

 rhizophyllum, Linn. sp. 2. p. 1078 ; Michx. fl. 2. p. 264; Pursh, ft. 2. p. 666; Bigel. 

 ft. Bost. p. 392 ; Torr. compend. p. 382 ; Beck, lot. p. 452 ; Darlingt. fl. Cest. p. 580. 

 Camptosorus rhizophyllus, Presl, I. c. 



A prostrate creeping fern, growing in dense patches, often entangled. Frond smooth, 4-8 

 inches long and from half an inch to an inch wide at the base, tapering to a very long almost 

 filiform point, which often takes ruot at the end, forming a tuft of new fronds ; the margin 

 usually entire or obscurely crenate, but sometimes deeply and irregularly sinuate. Sometimes 

 the frond is bifid, with two long points, and occasionally one of the divisions is again forked. 

 The base also is often hastate, or conspicuously auricled. Veins reticulated, forming large 

 oblong areolae. Sori scattered ; some of them produced from the upper, others from the under 

 side of the primary veinlets, often approximating in pairs, which are sometimes confluent 

 (as in Scolopendrium). 



Moist rocks, generally on limestone : not common. Fr. July. Endlicher refers this species 

 to Scolopendrium, of which it forms his section Camptosorus. 



