316- BOTANICAL GAZETTE _ [NOVEMBER 
10-4 May 7, 1900, Exposure June 12. Filaments have grown from the orig- : 
inal palmelloid cells but these break up as soon as the cells become afew — 
days old. Original material is seen at the upper left. aa 
Fig. 11. Culture no. 126a. Palmella from no. 50 put into K, 2892V x : 
10-4, May 7, 1900. Exposure May 28. Typical palmellaform,. = = 
Fic. 12. See explanation of fg. 9. : 
Fic. 13. Culture no. 128a. Palmella from no. 50 put into B, 2892 VX 
10-4 May 7, 1900. Exposure May 28. Typical palmella form, Material — 
moved slightly during exposure, but its form is well shown, % 
Fics. 14 and 15. Cultures no. 145@ and 1454. Both these cultures pal 
mella from no. 50 put into A, 96 V X 10-4 May 7, 1900. Exposure May 28. 
Filaments radiate from the original colonies and many new filaments have 
been formed from zoospores. In fig. rg the material was floating, in figs 
75 it was resting on the bottom of the dish. The latter shows no filaments — 
from zoospores. ‘They usually float on the surface. 
Fic. 16. Culture no. 1494. Palmella from no. 50 put into E, 76 V X 
10-4 May 7, 1900. May 23 many new filaments had been formed both at 
edges of original masses and by zoospores. Exposure May 28. At that ; 
time the filaments from zoospores were long and their older cells or round: a 
ing up. These are shown. Zoospores and young filaments were still plenty 
ful but did not occur in the field where the exposure was made. Many of the 
older cells are empty, having produced zoospores. 
Fig. 17. Culture no. 139@. Palmella from no. 50, 
1o-+ May 7, 1900. Exposure June 16. Zoospoores h 
put into A, 964 4 x 
ave been formed @ 
palmelloid célls almost immediately. There are no filaments : 
than three or four cells in length. Some resting spores which will an 
nate are shown, ; 107 
Fig. 18. Culture no. 148a. Palmella from no. 50, put in response: 
May 7, 1900. Exposure May 26. Shows typical weak solution 
Surface covered with filaments produced from zoospores. ee 
Fig. 19. Culture no. 140a. Palmella from no. 50, put it ae 
10-4 May 7, 1900. Exposure June 15. Many zoospores were P! : Figure 
germinated but went almost immediately into the palmella wee ee 
shows filaments, palmella and some germinating Spores. D, 2892 x 
Fig. 20. Culture no. 130a. Palmella from no. 5°, put into. : any te : 
10-4 May 7, 1900. Exposure May 28. Palmela still with scarce!y a 
dency to form filaments at edges. ike 6 NXIM 
Fig. 21. Culture no, 125a. Palmella from no. 50, aot oroduced 08 
_ e been } ‘ +l 
May 8, 1900. Exposure June 15. Long filaments hav a any rosea 
zoospores. Some of their older cells are becoming roun 
not yet germinated are seen. Most of these germinated ee appearane 
Fig. 22. Culture no. ro8a. Filaments from no. 83a (Ww 
