398 University of California Puhlications in Botany [Vol. 6 



upper surface is more highly developed than the lower, and bears 

 the nemathecia. 



Coriophyllum has some resemblances to EtJielia, a subgenus of 

 Peyssonnelia established in 1913 by Mrs. A. Weber-von Bosse, to 

 include certain forms from the Indian Ocean which differ from true 

 Peyssomieli-a in having a " mesothallus " instead of a basal or "hypo- 

 thallus." As shown in her diagram, the cells of the mesothallus are 

 compact and almost parenchymatous, and the plants are wholly 

 sterile. Coriophyllum has a median tissue composed of very delicate 

 anastomosing threads. The relationship to the Indian Ocean plant 

 can not be established until more is known of the methods of repro- 

 duction in both, particularly in Ethelia. 



This is the only known rock-incrusting form of uncalcified Rhodo- 

 phyceae on our coast in which there is such a marked differentiation 

 in the histological character of the thallus. The central layer of 

 filaments give off numerous branches above and below, and these soon 

 assume a perpendicular position and are unbranched, parallel and 

 adnate to each other, thus forming a very compact cortex considerably 

 thicker above than below. There are no rhizoids developed as in 

 Peyssonnelia, and the thallus as found growing at Cypress Point 

 is more or less raised up from the rock, particularly in the older parts. 

 Careful observation will probably reveal the presence of this plant 

 in other localities along our coast; its close resemblance to other in- 

 crusting forms have protected it from being observed. 



Cumagloia Setchell et Gardner gen. nov. 



Frons e radice solida discoidea oriens, vulgo teres, flaccida, 

 gelatinosa, simplex aut parce furcata, ramellis numerosis, brevibus, 

 patentibus multifariis, vage positis, simplicibus aut 1-2 ramosis 

 induta; antheridia solitaria in apicibus filamentorum repetite 2- -3 

 chotomo ramosorum corticalium posita; carpogonium in trichogynum 

 longum rectum et gracile productum, in fronde profunde positum, 

 ramellis 2-cellulari suft'ultum; filamenta gonimoblastii e carpogonio 

 fructificato orienta, repetite ramosa primo horizontalia demum in 

 exteriorem partem curvantia, cum filamentis corticalibus intertexta 

 et carposporas numerosas immediate sub superficiem externam frondis 

 formantia; cystocarpia vage limitata; tetrasporangia adhuc ignota. 



Frond arising from a solid disk-shaped holdfast, usually terete, 

 flaccid, gelatinous, main fronds simple or sparingly forked, producing 

 at right angles numerous short branchlets from all sides without 

 definate arrangement, some of which may be in turn once or twice 

 branched ; antheridia solitary on the ends of repeatedly dichotomously 

 or trichotomously branched cortical filaments; carpogonium, with 



