390 THE SEA SHOEE 



10. Squamaria Frond lichen-like, rooted by under surface, 



composed of vertical filaments imbedded in firm gelatine, 

 Spores in beaded threads in wart-like projections. 



11. Spongiocarpece Frond cylindrical, branching, cartilaginous, 



composed of netted filaments imbedded in firm gelatine. 

 Spores large, in radiating clusters in wart-like excres- 

 cences. 



12. GelidiacecB Frond cartilaginous, inarticulate, composed of 



hair-like filaments. Spores attached to slender threads 

 in internal conceptacles. 



13. Sphcerococcoidece Frond leaf-like or thread-like, inarticu- 



late, cellular. Spores formed in beaded threads in ex- 

 ternal conceptacles. 



14. HapalidiacecB Frond minute, calcareous, composed of a 



single layer of cells. 



15. Corallinacece Frond calcareous. Spores in tufted threads 



at the bases of the conceptacles. 



16. Laurenciacecz Frond rounded or flattened, branching, 



inarticulate, cellular. Spores in external oval or globu- 

 lar conceptacles. Tetraspores irregularly scattered over 

 the branches. 



17. RJwdomelacece "Frond leafy, thread-like, or jointed, com- 



posed of polygonal cells. Spores in external con- 

 ceptacles. Tetraspores in distorted branchlets or in 

 receptacles. 



C. Melanospermeae Olive-spored weeds. Frond tough, leathery. 

 Spores in globular cavities in substance of frond. 



18. Ectocarpacece Frond jointed, thread-like. Spores attached 



to or imbedded in branchlets. 



19. ChordariaceeB Frond gelatinous or cartilaginous, com- 



posed of interlacing vertical and horizontal filaments. 

 Spores internal, attached to the filaments. 



20. Dictyotacea Frond inarticulate. Spores superficial, 



arranged in definite spots or lines. 



21. LaminariacecB Frond inarticulate. Spores covering the 



whole frond or in cloud-like patches. 



22. SporochnacecB Frond inarticulate. Spores attached to 



jointed filaments which are either free or compacted. 



23. Fticacece Frond inarticulate, large and tough. Spores in 



globular cavities. 



