3 



appears to terminate the main stipe is really at the tip of an 

 elongated lateral branch. The axis of the stipe is composed of 

 large ellipsoidal or short cylindrical cells densely packed together 

 and the cortex of a thin layer of polygonal colored cells. -The 

 sacks are much more succulent and more brightly colored than 

 the stipe and the structure of their walls Is sufficiently evident from 



fig- 7- 



Glceosiphonia verticillaris, n. sp. PI. LXXXVIII, figs. 5, 

 6, 9, 10. 



Fronds usually gregarious, solid, becoming hollow with 

 age, main axis fiHform-cylindrical, finely attenuated to- 

 wards the discoidal base, 2 to 8 inches long, about }i inch in 

 diameter, usually undivided and clothed throughout its length 

 with whorls of 3 to 6 fusiform branches, ^ to )4 inches long. 

 In some cases a few of the lower branches are transformed into 

 secondary axes with whorls. Cystocarps numerous, im- 

 mersed among the cortical filaments of the branches, desti- 

 tute of proper envelope. Sporiferous mass simple with a thin 

 gelatinous covering. Tetraspores ? 



On stones in shallow coves, Santa Cruz, Cal. 



This is another of the many interesting species discovered by 

 Dr. Anderson. It is of a soft gelatinous substance and a beau- 

 tiful rose color when fresh, but is so delicate that it is easily 

 broken. The microscopic structure of the frond is like that in 

 species of Calosiphonia and Glceosiphonia. There is a single 

 axial filament of large cylindrical cells from whose central por- 

 tions arise at right angles whorls of four branches which divide 

 dichotomously. From the lower joints of the branches arise a 

 series of descending filaments which interlace with one another 

 and give compactness to the axis of the frond. By successive 

 dichotomies of the horizontal whorls, the cells becoming shorter 

 and rounder, there is formed a series of corymbose branches 

 which make the cortex of the frond. The fructification Is shown 

 in Plate LXXXVIII, figs, 5, 6 and 10. The figures were drawn 

 from alcoholic material collected by me in April, 1885. As far 

 as I could judge from this material, the antheridia formed small 

 spots on the surface of the fructiferous whorls, but, as I found 

 them in only a few cases, it may be that the spots seen were not 

 really antheridia. The procarps are abundant at the base of the 



