294 University of California Puhlications in Botany [Vol. 8 



The host plant of "a" of the above distribution is Laminaria Sin- 

 cl-airii; and the host of "b'' of the same distribution is Dictyoneuron 

 calif or nicum. The plants under "b" are not quite typical, but with 

 our present knowledge seem too closely related to the typical form 

 to warrant separation from it. Its life history has not been studied. 

 The "net" character of the thallus is much less regular than in the 

 typical form. This may be due to the character of the cells of the 

 host plant. 



29. Internoretia S. and G. 



Thallus endophytic, consisting of profusely branched filaments, 

 at first of a single series of cells increasing by apical divisions per- 

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

 divisions, building up cjdindrical threads composed of numerous cells 

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

 network; chromatophore parietal, with one pyrenoid; reproduction 

 unknown. 



Setchell and Gardner, Phyc. Cont. I, 1920, p. 294. 



The genus Internoretia was proposed for a peculiar endophyte 

 found by Professor T. C. Frj^e, growing within the membranes of 

 Porphyra. Its reproduction not having been determined, it is added 

 to the numerous form genera of uncertain position and placed pro- 

 visionally among the Chaetophoraceae. It resembles Pseudodictyon 

 Gardner and Zygoiniitus 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 the more uniform network brought about by the regular giving 

 off of branches at right angles. 



Internoretia Fryeana S. and G. 

 Plate 18, figs. 3-6 



Cells of the terminal filaments 3.5-5/a diam., 3-5 times as long, 

 apical cell conical; cells of the older part of the thallus isodiametric, 

 angular; otherwise as the genus. 



Growing within the membrane of Porphyra Naiadum. Friday 

 Harbor, Washington. 



Setchel land Gardner, Phyc. Cont. I, 1920, p. 295, pi. 23, figs. 3-6. 



This most interesting little plant is as yet known only from the 

 collections and observations of Professor T. C. Frye. It generally 

 occurs in such abundance as to discolor the host plant. In some years 



