1925] Setchell-Gardner : MeJanophyceae 649 



Egregia laevigata f. borealis Setchell 



Form with entire sporophylls and with blade and ligulate portions 

 roughened slightly witli pointed papillae. 



Growing in the upper sublittoral belt. Carmel Bay, California. 



Setchell, in Collins, Holden and Setchell, Phyc. Bor.-Amer. 

 (Exsicc), no. XL. 



This plant, which in its well developed form with capillary dis- 

 sected leaflets, is known as the "Feather Boa," is usually readily to 

 be distinguished from its sister species. Toward its northern limit, 

 it is not common, occurring as f. horealis along with E. Menziesii and 

 presenting forms with few to fairly numerous papillate roughenings, 

 appearing as if of possible hybrid origin. 



SERIES 2. APLANOSPOREAE ser. nov. 



Fronds of moderate size, filamentous and monosiphonous (Chori- 

 stocarpaceae) or polysiphonous (Tilopteridaceae) or complanate 

 (Dictyotaeeae) ; reproduction by both sexual and asexual methods; 

 sexual reproduction isogamous ? or heterogamous ; non-sexual reproduc- 

 tion brought about by the formation of aplanospores, one or more, 

 usually four, in a sporangium and, in some genera, by biciliate zoo- 

 spores; alternation of generations known in some species (e.g., Dictyota 

 dichotoma in which reduction takes place at the time of aplanospore 

 formation). 



The Aplanosporeae consists of two orders, viz., the Tilopteridales 

 and the Dictyotales. The series is characterized by certain of the 

 members of both orders bearing non-motile, non-sexual spores which 

 may be single (Tilopteridales) although possessing (in some cases at 

 least ) four nuclei at maturity or may be formed in fours from a single 

 mother cell (Dictyotales). The Tilopteridales resemble the Ectocar- 

 pales in vegetative structure and may have unilocular zoosporangia 

 giving rise to biciliated zoospores. There are no representatives of 

 this order on our coasts. 



