138 
On the surface of bamboos, palm trunks, and the bark of 
everal there were found everywhere Trentepohlia, Scy- 
tonema, Stone, Gleocapsa, and Chlorella. On the leaves of 
several trees and bushes were spots of Phycopeltis and Cepha- 
leuros, very c 
he ee ae Mivseaes took place on the sixth of Feb- 
ruary and on the same day an excursion along the road to the 
mesa was undertaken. Some days later I walked farther over 
the mesa. The only algae to speak of here were almost wholly 
philous ones on the dry slopes, which consisted partly of 
ich vegetation consisting of yceae, as 
Scytonema, Stigonema, Symploca, and Phormidium, someti 
Mesotaenium also grew here on the red clay. On the rocks were 
found quite often Chlorella and Trentepohlia. 
With Mayagiiez as a center, a series of excursions were under- 
taken in different directions, usually in the company of Dr 
N.L. Britton. But even in the town itself rich collections were 
Ww th 
made, especially of aerophilous algae on the wall o e] 
garden and on arks, house-walls, etc., at the Agricultural 
tati In the last-named locality also were found, besi 
Spirogyra with zygotes in a ditch, and perhaps a new species of 
hlorella on tree bark. 
On the ninth of February an 1 automobile trip was undertaken 
in the town, on ea ‘ocks and cliffs along the road north of 
the town. Besides the aerophilous genera already mentioned, 
there was found also Porphyrosipho the bark of the tree 
there grew, of course, species of Trentepohlia very abundantly. 
