persistent, bivalve ; the true one being the lower valve, 

 affixed laterally by semi-circular line, ^he accessory one 

 being like a cap, formed of teeth of frond, and covering 

 the sori. 



This tribe, containing Balantium, Kaulf , Cystodiiun, I. 8ni., 

 Culcita, Pr., Leptopleuria, Pr., Dicksonia, Pr., Patania, Pr., 

 Cibotium, Kaulf., Thyrsopteris, Kze., and Deparia, Hooker, is not 

 represented in South Africa. 



TRIBE 6. 



AdiantacecB. Pr. Sori linear, or oblong, or oloboso ; 

 marginal, seldom sub-marginal ; fixed on underside of in- 

 volucre, springing from end of veins or veinlets. Recep- 

 tade linear or dot-shaped. Involucre formed of reflexed 

 margin, bearing the capsules, linear, oblong, semi-orbiculatc, 

 or semi-lunate. 



Sect. 1. Adiantarm, Pr. Sori separate, but soon con- 

 fluent, covering the margin of the whole pinna), on edge 

 of teeth or segments. 



Gen. 1. — Pteris. L. Sori linear, marginal, continuous. 

 Veins simple or forked. Involucre broad. 



Gen. 2. — Lomaria. Willd. Fertile frond contracted ; 

 veins ditto ; sori sub-marofinal. 



Gen, 3. — Campteria. Pr. Like Pteris^ but lower veins 

 anastomosing and arching at sinus. 



Gen. 4. — Allosorus. Bernh. Sori roundish, separate, then 

 confluent and linear, hid by folded margin and involucre. 



Gen. 0. — Cryptogrmnma. Br. Sori linear, on oblique 

 veins, hid by folded margin ; no involucre. 



Gen. Q.—Adiantum. L. Sori marginal, globose, kidney- 

 shaped, oblong or linear ; distinct, or confluent, or continuous. 

 Involucre corresponding to sori, formed of reflexed margin of 

 underside of frond, and bearing the capsules beneath. 



Gen. 7. — Cheilcuithes. Sw. Sori marginul, globose, 

 generally upon a lobe or tooth of the margin of frond, which 

 becomes reflexed, solitary, contiguous or confluent. Involucre 

 kidney-shaped or oblong. 



Haplopteris, Pr., Litobrochia, Pr., Ampbiblestra, Pr., Corato- 

 dactylis, I. Sm., Onvchium, Kaulf, Jamcsonia, Hook, et Greville, 

 Hewardia, I. Sm., and Ochropteris, L Sin., are not represented ui 

 South Africa. Platyloma, I. Sm., is included in Allosorus, Bernh., 

 and Cassebeera, Kaulf, in Cheilanthes, Sw. 



