THE MAKIXE ALG/E OF NEW ENGLAND. 67 



Exs. — AIl;. Am. Bor., Fallow, Anderson »^' Eaton, Xo. 0.5. 



On stones at low tide. 



Eastport, Maine ; Cape Ann, Mass. 



Wo have r«'fi«rroil to tho prosont species .1 rather hirjje form foiiml abundantly in 

 September, 1-^77, at Eastport, near Do^ Island, where it <^rows with Chorduria Jlagel- 

 U/ormis, which it somewhat resembles in habit. It is much coarser than D. f<cnicu- 

 laceui, and of a darker color, and the branches are long and tlagellato, and furnished 

 with comparatively few secondary branches. The Capo Ann specimens are smaller 

 and apprv>ach nearer D. fwniculacen^. The Eastport form can hardly bo regarded as 

 an extreme state of D. fanicidaceous, but whether it is really the J), hippuroides of Are- 

 schoug admits of some doubt, as Areschoug descril)es his species as being only six or 

 seven inches long. According to Areschoug, the conjugation of zoospores has been ob- 

 served in this species. 



Family ECTOCARPE^E. 



Fronds tilamentous, monosiplionous or sometimes partly polysipho- 

 nous, cortex nidimeutary or wanting; sporangia either in the continu- 

 ity of the tilaments or external, sessile or stalked ; unilocular sj^orangia 

 globose or euboidal ; phirilocular sporangia muriform (formed of numer- 

 ous small rectangular cells densely aggregated in ovoidal or lanceolate 

 masses) ; growth trichothallic. 

 Fronds polysiphonous above, mouosiphonous below, densely beset above 



with very short horizontal branches . .*. Myriotrichiu, 



Fronds generally mouosiphonous throughout, branches free, opposite or 



alternate Ectocarpus, 



MYIUOTRICHIA, Harv. 



(From ^vptoc, a thousand, and dpi^, a hair.) 



Fronds olive-brown, filamentous, at first consisting of a single row of 

 cells, which by transverse and longitudinal division afterwards form a 

 solid axis; branches short, closely approximated, radiating in ftll direc- 

 tions, formed by outgrowths from the superficial cells of the axis; uni- 

 locular sporangia spherical, borne on the axis between the branches; 

 l)lurilocular sporangia unknown; main axis and branches ending in 

 hyaline hairs. 



A genus comprising three species which are hardly distinct. They f<)rm snuill tufts 

 or fringes on dilVerent /Vt<r(W/>orr<c, especially on Scytoniphon, and are recognized by the 

 numerous short branches which in some cases almost cover the main axis and cause 

 it t« nsemble a Stltjontma. The development of the frond is given in detail by Na'geli 

 ill Die neiiem Algensysteme. 



M. CLAV.EFOUMLS, Ilarv., riiyc. Ilrit., PI. 101. (.V. Hnrrnjand^ XiCg. 

 partim.) 



Fronds half an inch to an inch in length, club-shaped in outline, axis 

 clothed throughout with branches, ui)per branches longer than lower 

 and bearing secondary branches. 



