^917 Muenscher ; Key to Phaeophyceae 255 



KEY TO SPECIES 



A. Plurilocular sporangia long, with pointed tips ; chromatophores irregu- 

 lar or band-shaped or branched. 



B. Sporangia usually on short stalks or sessile, not tipped with hairs. 



1. E. confervoides 



BB. Sporangia usually on long stalks, not sessile, often tipped with 



hairs. 2. E. siliculosus 



AA. Plurilocular sporangia ovate or cylindrical, without pointed tips ; 



chromatophores disc- or lens-shaped. 



C. Sporangia cylindrical, on short stalks. 3. E. cylindricus 

 CC. Sporangia broadly ovate, truncate, sessile. 4. E. granulosus 



1. EcTOCARPus CONFERVOIDES (Roth) Le Jol. List. Alg. Cherb. p. 75; 



(Roth, Catal. Bot. 1: p. 151-152). Fig. 3 



Plants tufted, two cm. to four dm, long; attached to the substratum 

 by horizontal creeping filaments, often entangled at the base. Branches 

 alternate, gradually tapering, sometimes corticated ; larger branches with 

 cells 35 to 50 /x broad, as long to one-half as long as broad; chromatophores 

 large, irregular, band-form, few in each cell, Plurilocular sporangia nar- 

 rowly lanceolate, subulate to ovate and acute, sessile or short stalked ; 

 unilocular sporangia ovate, globose or elliptical. 



A variable species represented by at least several forms. On Nereo- 

 cystis Luetkeana, Desmarestia ligulata and Desmarestia aculeata. 



2. EcTocARPus SILICULOSUS (Dillw.) Lyngb. Hydrophyt. Dan. p. 131. 



Fig. 2 

 Plants in tufts up to several dm, long, pale olive-green, soft. Fila- 

 ments slender, much branched ; cells 20 to 40 /x broad, several times as 

 long ; chromatophores irregular bands, one or several in a cell ; plurilocular 

 sporangia long and narrow, pointed, often ending in a colorless hair, on 

 long many-celled stalks ; unilocular sporangia ovate, on lateral branches. 

 A variable species represented by several forms. Forming light 

 brown mats on rocks in shady places near low tide land. 



3. EcTocARPus CYLINDRICUS Sauud. Phyc. Mem., Calif. Acad. Sci. Bot. 1 : 



p. 150, pi. 16. Fig. 4 



Plants forming a compact mass several mm. long on other algae. 

 Creeping filaments branched; erect filaments simple or with few branches 

 below, of same size thruout ; cells 1 8 to 30 /a wide, usually several times as 

 long as wide; chromatophores numerous, disc-shaped. Plurilocular spo- 

 rangia lateral, on a one- to several-celled stalk, erect, cylindrical or obo- 

 vate ; unilocular sporangia on different filaments, oval or elliptical, usually 

 on a one-celled stalk or sessile. 



Reported from Whidby Island by Setchell and Gardner (14). 



