135 
sopogon and several Chiorophyceae in brooks; but the stay at 
San Lorenzo became a failure. The river bed consisted of fine 
sand from integrated syenite and this made an altogether very 
poor ground for algae, probably because the grains of sand are 
*y dq AA eee A Fm 5 ge fs Pa +, hick +h 1 
easily g g 
can attach themselves. I have also made the observation that 
interrupted, as a police officer arrested me as a suspicious char- 
acter. I was, however, readily discharged after a short exami- 
nation at the police station, but the publicity which attended 
the arrest in the little town hindered me from going undisturbed 
n 
the large rocks which lay distributed over the landscape there 
were often found a rich vegetation of Gloeocapsa, Scytonema, 
and Stigonema, and sometimes Trentepohli 
During my stay at Fajardo, January 25-28, Hees was a heavy 
Pp 
cumstances it was naturally impose i see ne algae tp in : the 
dirty water, and Ih 
which will occur at every rainstorm, must make the chances of 
the rivers and brooks of that side of the island. It was therefore 
mostly aerophilous a that I collected around Fajardo, where 
especially the old stone bridges showed themselves very richly 
covered with Myxophyceae and Trentepohlia. 
Play 
phyceae and among these especially desmids. Near the a 
salt in the ground, was found a rich vegetation of Phormidium 
and Lyngbye. 
