4 2. Ceterach. I. FILICES. PLend.cf. 



B. PolypodiacEjE. Capsules nearly surrounded with 

 an elastic ring which bends back when the capsule bursts ; 

 Involucrum none, except the hairs which surround the 

 capsules. 



II. 2. CETERACH. Er. Cordus. Miltwaste. 



Sori transverse, linear. — Root fibrous; frond cespitose, 

 pinnatifid; lower surface covered with lanceolate, acute, 

 serrulate, reticulate, brown, shining, membranous scales, 

 which enclose the capsules. 



Ceterach offic'marum. Shop miltwaste. 



Frond pinnatifid; lobes confluent, obtuse, not notched, 

 beneath paleo-squamose ; scales not notched. 



Ceterach officinarum, C. Bauhin, Pin. 354. 



Asplenium sive Ceterach, Raii Syn. 118; Ger. em. 1139. Park, 1046. 



A. Ceterach, Lin. S. P. 1538. 



A. sinuosum, Salisb, Pr. 403. 



Scolopendrium Ceterach, Sym. Syn. 193. 



Blechnum squamosum, Stokes Bot. Mat, Med. 617. 



Gramnites Ceterach, Swartz Syn. Fit. 23. 



Spleenieort. 



Calcareous rocks and old walls ; perennial ; nearly all 

 the year. 



Root black; Frond cespitose, 4 — 8 in. high, spreading, 

 lanceolate, lohes alternate, rarely opposite; smooth above; 

 Capsules auburn. 



III. 3. POLYPODIUM. Theophrastus. Polypody, 

 Sori round, in rows more or less distant from each other. — 



Root creeping, torulose, scaly, fibres villose; frond pin- 

 nately divided, sometimes naked, or furnished with simple 

 hairs, and long, lanceolate, reticulate, membranaceous 

 scales. 



1. P oly podium vulgar e. Common polypody , 



Frond deeply pinnatifid ; lohes linear-lanceolate, crenu- 

 late, approximate ; sori solitary ; rhizoma chafiy. 



Polypodium, Raii Syn. 117, 1 ; Ger. em. 1 132. 

 Pol. vulgnre. Park. 1039 ; Lin. S. P. 1544. 

 Polypody of the oak. VVallfern. Polypody. 



Trunks of old trees, walls ; perennial ; May to October. 



Frond 4- — 8 in. high, erect, lanceolate, acute; sori in 

 two rows parallel to the ribs. 



Root sweetish, but grows bitter by long boiling; gently 

 purgative when fresh. 5vj infused in 3ss of boiling water 

 is sufficient for two doses. 



