294 Vniversity of California Puhlications in Botany ['^'ol. 7 



rather than with Epicladia, which has the habit of gro^\•ing on the 

 outside of the liost. Tliis habit of growth seems to be the only one 

 by wliicli tlie two genera are distinguished as far as the diagnoses 

 reveal. Little, however, is known concerning the reproduction in 

 Epicladia, and uiilil the matter can be cleared up it can have but 

 little claim to generic distinction. Reinke expressed doubt as to the 

 validity of the genus when he diagnosed it (1889). Collins (1909) 

 has retained both genera, and under Endoderma (Entocladia) has 

 included two species, viz., E. pithophorae West and E. polyniorpkum 

 West, which are epiphytic, and thus, as he remarks {loc. cit., p. 280), 

 "connects Endoderma with Epicladia, but the filaments do not unite 

 to form a definite disk." 



Entocladia codicola seems to be confined to the coast of California 

 and to the above mentioned host plant, at least, examination of con- 

 siderable material of different species of Codium in different localities 

 ranging from Sitka, Alaska, to southern California has not revealed 

 its presence elsewhere. 



Internoretia gen. nov. 



Thallus endophyticus, e filamentis profuse ramosis, primo cellulis 

 in serie simpliei per divisiones apicales verticaliter ad longitudinem 

 posit as augescentibus, tardiore per divisiones obliquas et longitudi- 

 nales, filamenta cylindrica cellulis numerosis composita formantibus ; 

 filamenta ramos ad angulos rectos emittentia, ramis anastomosantibus ; 

 chromatoi)hora parietalis, pyrenoidibus singulis ; generatio ignota. 



Tliallus endophytic, consisting of profusely branched filaments, at 

 first of a single series of cells increasing by apical divisions perpen- 

 dicular to the long diameter, but later by oblique and longitudinal 

 divisions, building up cylindrical threads composed of numerous cells 

 in cross diameter ; branching at right angles, anastomosing, forming 

 a network ; chromatophore parietal, with one pyrenoid ; reproduction 

 unknown. 



The genus Internoretia is proposed for a peculiar endophyte found 

 by Professor T. C. Frye, growing within the membranes of Parphyra 

 Naiadum. Its reproduction not having been determined, it is among 

 the numerous form-genera of uncertain position and placed provision- 

 ally among the Chaetophoraceae. It resembles Pseudodictyon Gardner 

 and Zygomitus B. and F. From the former it differs in forming solid 

 filaments several cells in thickness. From Zygomitus, Internoretia 

 differs in the greater regularity of its solid portions and in tlic more 

 uniform network brought about by the regular giving off of branches 

 at right angles. 



