1917] Gardner: New Pacific Coast Marine Algae I 397 



Coriophyllum expansura Setchell et Gardner gen. et sp. nov. 



Plate 33, fig. 2 



Thallo purpnreo-rnhro, 500-800/x crasso, 5-8 vm. diam., ad saxa 

 laxe et sine rhizoideis adhaerente; cellulis filamentoruni verticaliuni 

 8-12/A longis, 4-6/A crassis; sporangiis angnste ellipticis, 60-70//, longis, 

 22-28/i latis, pedieello uiiicellulari snffiiltis; paraphysibus numerosis, 

 leviter elavatis, 10-14 cellulis eonipositis, su))ra niaxime ad eentrnni 

 nematheeiorum eurvatis, infra o/x diam., supra -Jr.o/x diam. 



Thallus dark i)iirplish red, 500-800/x thick, 5-8 em. in diameter, 

 adliering- loosely without rhizoids to the rocks; cells of perpendicular 

 filaments 8-12//, long, 4-6/x wide; sporangia narrowly elli])tical, 60-70/i 

 long, 22-28/x wide, on a one-celled pedicel ; paraphyses numerous, 

 slightly clavate, 10-14 celled, the upper part curved mostly toward 

 the center of the nemathecia, Sjx in diameter below, 4.5/x above. 



Growing near the high tide limit at Cypress Point, ]\Ionterey 

 County, California, December, 1913 and 1915. The type is no. 188972, 

 Herbarium of the University of California. 



While collecting Hildenhrancltia material at Cypress Point, I 

 noticed a few small areas of rock a little below high-water mark 

 covered by a plant that seemed to be somewhat different from the 

 surrounding incrusting forms. A little closer inspection led me to 

 remove some of the material, which was of a more leathery consistency 

 and more easih- removed than the other forms. The material was 

 only superficial^' examined at the time and then laid away for future 

 study. Not until nearly two 3'ears after, when those incrusting forms 

 were singled out for special study, was the structure of the plant 

 revealed. It is found to conform to the description of no known 

 genus and the luime Coriophyllum is here proposed to receive the 

 plant. 



The sj'stematic position of Coriophijlluin will necessarily have to 

 remain in doubt until the sexual plants are discovered. It is placed 

 only provisionally in the stjuamariaceae. It is very closelj' related to 

 Rhododermis in the manner of the formation of the tetrasporic nenia- 

 tlircia, but in its vegetative characters it is quite remote from that 

 genus. The tetrasporangia are developed on short pedicels among 

 numerous slender clavate paraphyses, whieli are quite markedly 

 curved in the tei-miiial portion. The differentiation of the thallus into 

 a central horizontal laj'er and a cortical hiyef al)ove and below (pi. 

 33, fig. 2) is suggestive of relationsliip with some of the membran- 

 aceous forms which are attached only at the base by a small holdfast. 

 However, the thallus of Coriophtjllnni is not symmetrical with respect 

 to the relation of upper and lower surfaces to the central layer. The 



