Z SYNOPSIS OF BRITISH BBAWBBDS. 



\oki we <ii inched to external, jointed filn- 



I we i itkerjfree, or compacted together info 

 lenob'UJce masses. 



* Spores attach illed filaments. 



VII. Dbsmabestia. Frond solid, distichous, filiform or flat. 

 YIII. Arthrocladia. Frond filiform, nodose, traversed 

 by a jointed lube. 



** Spores id hnobrWct receptacles. 



IX. Sporocitxus. Receptacles lateral, stalked. 



X. Carpomitra. Receptacles terminal. 



Order 3. Lamixartace.e. Olive-coloured, inarticulate seaweeds, 

 whose spores arc supi rficial, < itlier form ing cloud-like patches, 

 or covering the whole surface of the frond . 

 XL Alaria. Stipitate. Stipes ending in a midribbed leaf. 



XII. Lamixaria. Stipitate. Stipes ending in a ribless 

 leaf. 



XIII. Chorda. Frond leafless, cylindrical, hollow ; the 

 cavity interrupted by transverse partitions. 



Order 4. Dictyotace.e. Olive-coloured, inarticulate seaweeds, 

 whose spores are superficial, disposed in definite spots or 

 lines (sori). 



* Root coated with woolly fibres ; frond flat. 



XIV. Cutleria. Frond ribless, irregularly cleft. Sori 

 dot-like, scattered. Spores pedicellate, containing 

 numerous sporules. 



XV. Haliseris. Frond midribbed. 



XVI. Padixa. Frond ribless, fan-shaped, concentrically 

 striate. Sori linear, concentric, bursting through the 

 epidermis. 



XVII. Zonaria. Frond ribless, lobed, concentrically stri- 

 ate. Sori roundish, containing spores and jointed 

 threads. 



XVIII. Taoxia. Frond ribless, irregularly cleft, some- 

 what fan-shaped. Sori linear, concentric, superficial, 

 alternating with scattered spores. 



XIX. Dictyota. Frond ribless, linear, dichotomous. Sori 

 roundish, scattered, bursting through the epidermis : 

 or, (on distinct plants) scattered spores. 



** Root a minute naked disc ; frond cylindrical, branched. 



XX. Stilophora. Spores concealed among moniliform 

 threads, which are collected into convex, wart-like sori. 



