1920] Setchell-Gardner : Chlorophyceae 305 



FAMILY 13. TRENTEPOHLIACEAE de-toni 



Thalli filamentous, branched, forming diffuse or feltlike tufts or 

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

 several nuclei ; chromatophore 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 ; Hansgirg, Ueber 

 Gatt. Her post eiron; etc., 1888, p. 222 ; Collins, Green Alg. N. A., 1909, 

 p. 315; West, Algae I, 1916, p. 305. Chroolepid<iceae 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 affects, 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 Mart. 



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 when dried 

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

 chromatophore without pyrenoid, band-shaped or broken ; reproduc- 

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

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

 calary transformed vegetative cells. 



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



The members of this genus are usually found upon wood or the 

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

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



