1917 



Muenscher; Key to Phaeophyceae 



267 



Hedophyllum subsessile 



PLATE 56 

 Fig. 21. Sketch of plant. (After Setchell.) X about 0.2. 



13. CYMATHERE J. Agardh 



1. Cymathere triplicata (Post. & Rupr.) J. Ag. De Laminarieis p. 29; 

 {Laminaria triplicata Post. & Rupr., Illustr. Alg. p. 10). Fig. 22 



Holdfast a solid conical disc about two to three cm. in diameter; stipe 

 exceedingly short, about five cm. in length ; blade long and narrow, one 

 to four meters long and one to two dm. wide, usually entire but some- 

 times splitting into strap-like segments at the tip ; surface of blade very 

 smooth, plicate, with three to five longitudinal ridges and grooves which al- 

 ternate on the upper and lower surfaces. 



In the lower littoral zone on wave-beaten shores ; sometimes dredged 

 from gravel and shells in the upper sublittoral zone. 



14. PHYLLITIS Kuetzing 



1. Phyllitis fascia (Mueller) Kuetz. Phyc. Gener. 3: 342, pi. 24; (Lam- 



inaria fascia, Ag. Sp. 1: p. 122). Fig. 23 



Plant body a solid membranaceous, lanceolate or linear blade, tapering 



toward the base to a short rounded stalk; blade composed of two layers 



of tissue, the cortical layer of small cuboidal cells, the inner layer of oblong 



