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BOTANICAL OBSERVATIONS ON THE AZORES. 195 
DESMIDIACEAE. 
STAURASTRUM, sp. Archer 329. 
San Miguel. 
S. srrrotatum, Arch. Archer 330, 
San Miguel. 
S. TETRACERUM, Ralfs. Archer 330. 
San Miguel. 
EUASTRUM ANSATUM, Ralfs. Archer 330. 
San Miguel. 
ARTHRODESMUS BIFIDUS, Breb. Archer 329. 
San Miguel. 
RHAPHIDIUM POLYMORPHUM, Fresen. Ankistrodesmus falca- 
tus, Archer 329. 
San Miguel. 
CosMARIUM BIOCULATUM, Breb. Archer 330. 
San Miguel. 
C. Meneeuinil, Breb. C. crenulatum, Archer 330. 
San Miguel. 
C. rrncotum, Ralfs. Archer 330. 
San Miguel. 
C. venustuM, Breb. Archer 330. 
San Miguel. 
Dispyincrium Tuwairesi, De Ton. Cosmarium Thwaitt- 
esii, Archer 330. 
San Miguel. 
CHLOROPHYCEAE. 
Pentium pieitus, Breb. Archer 330. 
San Miguel. 
Borryococcus Braunu, Kiitz. Moseley 322; Archer 328. 
?Chroococcus, Moseley 322, 323. 
San Miguel (1459, Lagoa das Furnas; 1460, 1461, 
Sete Cidades).— An abundant water bloom. 
This species was reported by Archer, J. c., as the most common 
chlorophyllaceous alga collected by Moseley at the hot springs of 
Furnas. The general appearance of the colonies and their larger 
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