404 Umversity of California rublications in Botany IVol. 7 



Eciocarpaccae Oltniaiins, .Morpli. uiul liiol. der Alg., vol. 1, 3904, 

 p. H50 (pro parte majore). 



It seems more consistent with the present usage in other subclasses 

 of the Thallophyta, to consider the extended Ectoearpaceae of Olt- 

 manns as an Order rather than as a Family. While the families under 

 it jiresent a very considerable variety in the details of structural 

 dilTerenees, they have in common the possession of plurilocular game- 

 tangia and an identity in size and sliiictui-c of \n>\\\ gametophyte and 

 sporophyte. The Eetoearpales are closely related to the Cutleriales. 1)ut 

 in the latter there are some decided differences between the two 

 generations. From the Sphacelariales, the Eetoearpales differ in the 

 absence of the conspicuous apical cell and the very different cell wall. 

 The cell wall, or the older layers of it. changes to black in the 

 Sphacelariales when treated with ran de Javelle, but does not show 

 this reaction in any of the Eetoearpales. The LaniiiKiriales are to be 

 distinguished from all the other orders of the Phaeosporeae by their 

 intercalary region of longitudinal growth in connection with their 

 microscopic gametophyte. The existence of a reduced gametopliyte 

 in the Dictyosiphonales separates them also from the Eetoearpales. 



Ectocarpus acutus nom. nov. 



Plate 48, figures 36-39, and Plate 49, figures 40, 41 



Frondibus 5-9 cm. altis, siccitate saturate fuscis, vivo olivario- 

 viridibus. phimosis; filamentis erectis, inferne plus rainusve intricatis 

 fasciculatisque. superne liberis, profuse ramosis. filamentis primariis 

 corticatis ; ramis plerumque alternis. strietis ; ramulis ultimis plerumque 

 secundis. acute sul)ulatis; cellulis leviter doliiformibus, 40-()0<x diam., 

 0.4-2-plo longioribus quam latis (\ailgo brevioribus quam latis) ; 

 chromatophoris crassis, irregulariter ramosis, in cellula quaque paucis, 

 pyrenoideas (plures) exhibentibus; zoosporangiis ignotis: gametangiis 

 numerosis et regulariter dispositis. cyliiulrieo-conicis. lOO-laOjn (usque 

 ad 230/x) longis, 20-35/x latis. 



Growing, for the most part at least, on larger ^Melanophyceae. 

 Puget Sound to central California (Carmel). 



Ectocarpus penicillatus Saunders, Phyc. Mem., 1889, p. 155. pi. 21, 

 figs. 3, 4 (not of Kjellm.). Ectocarpus confervoicles f. acuminatus 

 Collins, in Setchell and Gardner, Alg. N.W. Amer.. 1903, p. 237, iMar. 

 Alg. Vancouver Is., 1913, p. 106; Collins, Holden. and Setchell, Phyc. 

 Bor.-Amer. (Exsicc), nos. 1033, 1127. 



The type of the species is no. 2886, Gardner (Herb. I'niv. Calif., 

 no. 206991), collected at Carmel. California, in May, 1915, and grow- 



