APPENDIX. 375 



branous or fleshy, often of lax structure internally. Pavel- 

 lidia immersed in central substance of frond, very numerous. 



10. Dumontia. Frond cylindric, tubular, membranous. 

 Tufts of spores attached to wall of tube inside. 



11. Halymenia. Frond compressed or flat, gelatino- 

 membranaceous, surfaces separated by a few slender anas- 

 tomosing filaments. Masses of spores attached to inner 

 face of membranous wall. 



12. Ginannia. Frond cylindric, dichotomous, traversed 

 by a fibrous axis, walls membranous. Masses of spores 

 on inner face of wall. 



13. Kallymenia. Frond expanded, leaflike, fleshy-mem- 

 branous, solid, dense. Favellidia like pimples, half im- 

 mersed and scattered. 



14. Iridea. Frond expanded, leaflike, thick, fleshy- 

 leathery, solid, dense. Favellidia wholly immersed, densely 

 crowded. 



15. Catanella. Frond filiform, branched, constricted at 

 intervals into oblong articulations ; the tube filled with 

 lax filaments. 



4. Sub-tribe GLOIOCLADIE^E. Frond loosely gelatinous, 

 the filaments lying apart, surrounded by a copious gela- 

 tin. Favellidia immersed among filaments of periphery. 



16. Cruoria. Frond crustaceous, skinlike. 



17. Naccaria. Frond filiform, solid, cellular; ramuli 

 only composed of radiating free filaments. 



18. Gloiosiphonia. Frond tubular, hollow, walls com- 

 posed of radiating filaments. 



19. Nemaleon. Frond filiform, solid, elastic, filament- 

 ous, axis of a network of anastomosing filaments ; periph- 

 ery of moniliform free filaments. 



20. Dudresnaia. Frond filiform, solid, gelatinous, fila- 

 mentous, axis and periphery like the last. 



21. Cronania. Frond filiform, of a jointed filament, 

 whorled at the joints, with minute multifid, gelatinous 

 ramuli. 



