1920] Setchell-Gardncr : Chlorophyceae 305 



FAMILY 13. TRENTEPOHLIACEAE de-toni 



Tlmlli tilamentous, brauclied, forming cUtl'use or felt like tufts or 

 expansions, in some genera compact and discoidal ; cells with one to 

 several nuclei ; ehromatophore single and band-shaped or several and 

 lenticular, the chlorophyll masked by haematochrome ; zoosporangia 

 borne on geniculate or hooked cells, usually deciduous and producing 

 2-ciliated zoospores; gametangia terminal or intercalary producing 

 2-ciliated gametes. 



De-Toni, Consp. gen. Chloroph., 1888, p. 449 ; llansgirg, Ueber 

 Gatt. Herposteiron, etc., 1888, p. 222 ; Collins, Green Alg. N. A., 1909, 

 p. 315; West, Algae I, 1916, p. 305. Chroolepidaceae Borzi, Stud. 

 Alg., fasc. 1, 1883, p. 25 (in part). 



More recent authors agree in separating Trentepohliaceae from 

 Chaetophoraceae, principally on account of habitat and the presence 

 of haematochrome in the cells, masking the green of the chlorophyll 

 and giving an orange-red or yellow color to the members of this family. 

 The plants belonging to Trentepohliaceae are usually epiphytic, or 

 partially endophytic, but some species of Trentepohlia grow upon 

 rocks. Only one member of the family aifects, at times, a habitat 

 subject to the direct action of the sea water. Since that member has 

 been found in a marine situation on our coast, we feel compelled to 

 include an account of it. 



34. Trentepohlia ]\rart. 



Frond composed of dichotomously or irregularly branched, erect 

 filaments of a single series of cells, arising from irregularly branched 

 creeping filaments; branches arising either from the middle or from 

 the upper ends of the cells; color greenish at times in active vegetative 

 condition, changing to yellowish or red, fading to white wlnii dried 

 and dead; cells cylindrical to spherical with thick hyaline walls; 

 ehromatophore without pyrenoid, band-shaped oi- broken; reproduc- 

 tion by 2-ciliated zoospores in sporangia borne on special hooked oi- 

 curved cells, and by 2-ciliated gametes in lateral, termiiuil or inter- 

 calary transformed vegetative cells. 



Martins, Flora Cryptog. Erlang., 1817, p. 351. 



The members of this genus are usualh' found upon wood or the 

 trunks of trees, although certain species are found upon rocks. The 

 rock-inhabiting species as well as those found upon trees, are of 



