MR. G. $. WEST ON SOME CRITICAL GREEN ALGJE. 279 
EXPLANATION OF THE PLATES. 
(From Photographs taken by Dr. A. F. R. WOLLASTON.) 
PLATE 16. 
Fig. 1. Vegetation on Mt. Ruwenzori at 3500 feet, with Luphorbia, Acacia, and short 
grass. 
2. Tree Senecios, with Lobelia Stuhlmanni in the centre, at 9500 feet. 
Pate 17. 
~~ 
Fig. 3. Lobelia Gibberoa at 7000 feet. 
4. L. Deckenti in flat swampy ground at 11,000 ft, 
PLATE 18. 
Fig. 5. Senecio adnivalis to the rght showing branching, Lobelias to the left, Lobelia 
Wollastoni in front, at 12,000 ft. 
i. Steep slope with tree Senecios, probably Senecio adnivalis and Lobeha Wollastona, at 
13,000 ft. 
PLATE 19. 
~l 
Fig. 7. Lobelia Wollastoni at 12,500 to 13,000 feet. The Kyanga Peak is seen in the 
background. 
8. Very old tree Senecios at 12,500 feet : tree heath, Erica arborea, in the background. 
Some Critical Green Alge. By G.S. War, М.А., А.В.С.$., F.L.S., 
Lecturer on Botany at the University of Birmingham. 
(PLATES 20 & 21.) 
| Read 20th June, 1907.) 
During the examination of numerous collections of Algæ, I have repeatedly 
brought before my notice many forms about which little or nothing is known, 
and a brief account of the peculiarities and affinities of some of these may 
prove of considerable interest. The six Algæ dealt with in this paper are 
all members of the Chlorophycez. 
1. POLYCHAHTOPHORA SIMPLEX, sp. n. — P. cellulis subglobosis vel ovoideis, 
membrana tenue et homogenea ; parte dorsali cellule uniuscujusque setis 
longis flexuosis simplicibus non vaginatis 2-4 instructa ; chromatophoris 
singulis parietalibus, interdum eum granulis amylaceis minutis circ. 2-3, 
Diam. cell. veget. 15-20 ш; long. set, usque ad 210 и. (РІ. 20. figs. 1-6.) 
Hab. Shores of. Lough Gartan, Donegal, Ireland ; epiphytie on the sub- 
merged portions of various aquatic phanerogams, 
