CRYPTONEMIACE.^. 135 



lying apart in firm gelatine. Favellidia contained 

 within external tnbercles. Telrnspores massed toge- 

 ther in dense sori, sunk in the frond. [Plate 17, C] 



Sub-order 2. Spongiocarpe^. Frond solid, dense, cartilagi- 

 nous or horny. Favellidia of several imperfectly known. 

 Wart-like swellings composed of filaments sometimes con- 

 taining tetraspores, sometimes spores. 



IV. Chondrus. Frond flabelliform, dichotoraously cleft, 

 cartilaginous, of very dense structure. Tetraspores 

 collected into sori, immersed in the substance of the 

 frond. [Plate 17, D.] 



V. Phyllophora. Frond stipitate, rigid membranaceous, 



proliferous from the disk, of very dense structure. 

 Tetraspores in distinct superficial sori, or in proper 

 leaflets. [Plate 18, A.J 



VI. Peyssonelia. Frond depressed, expanded, rooting 

 by the under surface, concentrically zoned, membra- 

 naceous or coriaceous. Tetraspores contained in su- 

 perficial warts. [Plate 14, D.] 



VII. Gymnogongrus. i^rowc^ filiform, dichotomous, horny, 

 of very dense structure. Tetraspores strung together, 

 contained in superficial wart-like sori. [Plate 18, B.] 



VIII. PoLYiDES. Root scutate. Frond cylindrical, dicho- 

 tomous, cartilaginous. Favellce contained in spongy, 

 external warts. Tetraspores scattered through the 

 peripheric stratum of the frond, cruciate. [Plate 

 18, D.] 



IX. FuRCELLARiA. Root branching. Frond cylindrical, 

 dichotomous, cartilaginous. Favellie unknown. Te- 

 traspores deeply imbedded among the filaments of 

 the periphery, in the swollen, pod-like, upper branches 

 of the frond, transversely zoned. [Plate 18, C] 



Sub-order 3. Gastrocarpe.e. Frond gelatinoso-membrana- 

 ceous, or fleshy, often of lax structure internally. Favel- 

 lidia immersed in the central substance of the frond, very 

 numerous. 



X. DuMONTiA. Frond cylindrical, tubular, membrana- 



ceous. Tufts of spores attached to the wall of the 

 tube, on the inside. [Plate 20, A.] 



