456 Univcrsitii of California Publications in Botanij [Vol. 6 



Placoma violacea Setchell et Gardner sp. iiov. 

 Plate 38, figs. 1-3 



Thallo microscopico, 175-250/x. diam., irregular! ad leviter sphae- 

 rico, verrucoso ; tegmnentis dilute violaceis ; eellulis 3.5-4/a diam., 

 binis ad octonis freqiientissime quaternis, ad superficiem radiate 

 positis sed intiis sine ordine aggregatis; juvenis angulatis demum 

 sphaericis ; cytioplasmate homogeneo, dilute coeruleo-viridi. 



Thallus microscopic, 175-250/* diam., irregular to somewhat spheri- 

 cal, verrucose, tegument pale violet ; cells 3.5-4/i, diam., in groups of 

 2-8, mostly 4, arranged radially toward the periphery but mostly 

 without order in the interior, angular when young, later becoming 

 spherical ; protoplast homogeneous, pale blue-green. 



Growing on logs in company with other species of Myxophyceae, 

 along high-tide level. Cape Flattery, Washington. Type no. 3829, 

 Gardner. 



This species is similar to Placoma africanum Wille (1903, p. 90), 

 a fresh-water species collected in South Africa, but it differs from that 

 species in having a different habitat, viz., salt Avater, in having larger 

 cells aggregated into larger colonies, and in having a violet colored 

 tegument. 



' Dermocarpa protea Setchell et Gardner sp. nov. 



Plate 38, figs. 4, 5 



Cellulis forma magnitudineque maxime variabilibus, late pyri- 

 formibus ad anguste cuneatis, 40-120/* longis, prope apicem 6-40/1 

 diam., ad basim 3-7/1. diam.; parietibus hyalinis, 2-3/* crassis; cytio- 

 plasmate homogeneo, dilute coeruleo-viridi; gonidiis 3-3. 5/t diam., 

 divisionibus iteratis formatis. 



Cells extremely variable in shape and size, broadly pyriform to 

 narrowly cuneate, 40-120/i long, 6-40/t diam. at the apex, 3-7 /t at the 

 base ; cell wall hyaline, 2-3/i thick ; protoplast homogeneous, light blue- 

 green ; gonidia 3~3.5/t diam. formed by successive divisions of proto- 

 plast. 



Growing on Spongomorpha sp. West coast of Whidbey Island, 

 Washington. Type no. 467, Gardner. 



A single specimen of this species of Spongomorpha with the above 

 epiphyte growing upon it has thus far been collected. The terminal 

 portions were so thickly clothed with the epiphyte as to give it a very 

 decidedly dark appearance. Microscopic examination showed that 

 the colonies were unusually variable in shape and in size, some capping 

 the filaments, others completely surrounding and obscuring them for 

 some distance, and still others small and widely separated. Material 



