( 0LLJN8 WD III l;\ l 1 



CLAB8 phaeophyceae. 



Pamili ECTOCARPACEAE. 

 Pylaxella Bory. 



P. rn.\ m ens Schousl ■ Bornet, L889, p. 5, PI. I; P. II. -A.. \<>. 

 2076; Conferva fidvescens Schousboe ms ex Bornet. On sand-covered 

 n.ck- by lighthouse, St. David's bland, May, L913, Bervey. The 



plant agrees fully with Hornet*.- figure a- to form and dimension of 

 horizontal filaments and sporangia; the erect filaments are in part 

 simple, a- figured by Hornet, in part like those figured by Sauvageau, 

 L896a, fig. 1. being recurved near the tips, and hearing numerous 

 longer or shorter branches, mostly on the outer side of the curve. The 

 unilocular sporangia are rare, but well developed. /'. Hooperi, 

 Barbados, Miss Vickers, seems hardly distinct. In comparing the 

 description of P. fidvescens by Bornet with that of PylaieUa sp. 

 Ectocarpua II<><ij>rri Crouan) on the following page, the chief dis- 

 tinctive character of the latter would seem to he the Ethizoclonium- 

 like ramuli near the base; such ramuli were occasionally Been in the 

 Bermuda plant, hut were not at all abundant. 



EcTocARPts Lyngbye. 



1. Lower part of frond endophytic 2. 



1. Not endophytic 

 2. Only slightly endophytic, in Dictyopteris Justii; hugely free; pluri- 

 locular sporangia cylindrical. v E, Luteolus. 



2. Mostly endophytic, in Halymenia; pluriloeular sporangia OVOld. 



'.». E. parasiticus. 



3. Krect filaments arising from prostrate, branching filament-. L 



'.]. No distind prostrate filament-. .".. 



1. facet filaments with pluriloeular sporangia near base, no other branch- 

 ing. 7. E. elachistaeformis. 



4. l.reet filaments freely branched, bearing sporangia throughout. 9. 



5. Pluriloeular sporangia seriate on upper side of branches, near base. 

 5. Pluriloeular sporangia variously placed, not seriate. 8. 



6. Pluriloeular sporangia cylindrical 3. E. Mitchellae. 



6. Pluriloeular sporangia ovoid to conical. 7. 



