40n T^)}ivfrsihi of California Publications in BoUuty [Vol.7 



eelhilis juvcnis, anfrulato-laminacformilms, in cellnlis vetustioribns 

 fere re^ulariter discoideis; zoosporanfjjiis ifrnotis: gametangiis lateral- 

 ibus. plcruiiKine sessilibiis. iiitcnlum l-cellnlato pcdiccllatis. solitariis, 

 se.Miiulis aul ad ccllulaiu sin;iulaiii verticillatis, oI)tnsc-conicis ns(iue 

 ad spliacroidcis. 28-8V londs, 25-28/x latis, per filamentum totam 

 iis(|\ic ad pilos Irnniiiales seriatis. 



Growing' on CallUhamnion sp. Sitka. Alaska. T3'pe, Gardner, no. 

 3961 (Herb. Univ. Calif., no. 206998). July. 



Two eollections from Sitka, Alaska, but both made on the same day, 

 show a small Ecfocarpus growing on a species of CaUithamnion which 

 is so closely related to E. ovatus Kjellman (1877. p. 35) that perhaps 

 it may seem necessary at some time to refer it to that species. The 

 plants ai-e, however, less stout than those of Kjellman and witli more 

 nearly spherical gametangia. For these reasons and because of its 

 geographic remoteness and the somewhat different elimatic conditions, 

 we feel that it is desirable to describe the Alaskan plant as a distinct, 

 but closely related species. 



Ectocarpus chantransioides sp. nov. 



T'late 48, figures 28-31 



Frondibus e fila mentis contortis repentibu.sque oriendis. pulvinulos 

 densos hemisphaericosque, 4-8 mm. altos formantibus ; ramis profusis, 

 inferne alternis. superne plerumque secundis; filamentis primariis 

 ramisque non attenuatis, apice crescentibus ; ; eellulis 8-1 0/a diam., 

 inferne 2-3-plo longioribus quam latis. superne quadratis; chromato- 

 phoris taeniatis; zoosporangiis ignotis; gametangiis plerumque ses- 

 silibus. aut brevi pedicellatis. anguste cylindrieo-conicis, 80-110^1/. longis, 

 basim 16-20jli latis. 



Growing on boulders in the lower littoral belt. Three miles north- 

 west of Santa ]\lonica. California. Type. Gardner, no. 2523 (Herb. 

 Univ. Calif., no. 206988), November. 



The habit of Ectocarpus ch ant ransio ides distinguishes it at once 

 from all other species of the genus with the exception of E. hemi- 

 sphericus Saunders. The latter species is alw^ays found, so far as our 

 knowledge is concerned, epiphytic on Fucaceae, while the former 

 species is confined to rocks. Ectocarpus chantransioides has also more 

 slender filaments than has E. hemisphericns, not at all tapering, and 

 has distinct apical growth. The gametangia are differently shaped, 

 being longer and more slender. It is therefore very distinct even from 

 E. hcmiphcricus. It resembles the genus Choristocarpus of the family 

 Choristocarpaceae, as diagnosed by Kjellman (1897. pp. 190, 191^, in 



