quently being more compressed, but especially by most of the 

 upper ones being more or less dilated, complanate-palmate, up- 

 wards up to 10 mm. broad or more, by a thickness of about 1 

 mm., partly rather shallowly dentate with the apices nearly spines- 

 cent, partly deeply cleft, subulate, or now and then with the apices 

 truncate or nearly truncate. Cp. fig. 10. 



The colour of both the forms is a feebly pink with a'purplish 

 tinge, or yellowish pink. 



In a longitudinal median section of the upper part of a branch 

 the inner cells of the cup-shaped layers of tissue are nearly square 

 or rectangular, about 9 — 12 fi long and 7—8 p- thick. 



Some cystocarpic conceptacles appear in one of the branches 

 of both forms. They are scattered, slightly convex, or highest in 

 the centre and approaching a depressed-conical shape, but most 

 often scarcely perceptibly raised above the surface of the frond, 

 distinctly marked, seen from the surface 220 — 280 ;i in diameter, 

 with a single and small orifice. At maturity a part or nearly the 

 whole roof gets dissolved, the surrounding parts continue their 

 growth, and the conceptacles become overgrown. In a vertical 

 median section they are about 90 — 100 ft high and 200—230 /j. 

 in diameter. The carpospores are elongated-obovate, 50 — 70 fi 

 long and 25 — 35 p. broad. 



Two other conceptacles appearing together with the former 

 most probably are those of antheridia. They apparently are fully 

 developed, resemble the named organs in shape but are only about 

 100 \i in diameter seen from the surface. Also these probably 

 grow down into the frond. I, however, have not seen the spermatia. 



Overgrown conceptacles were scarce in the solitary piece of 

 a branch examined. The conceptacles of sporangia are unknown. 



Relation to other spedes. This species shows a rather great 

 afflnity to L. coralloides, from which, however, it distinguishes 

 itself particularly by the shape of the branches and conceptacles 

 of cystocarps. 



Occurrence. The coast of California, according to Mr. P. 

 Hariot. 



