Notes on algae of Bermuda and the Bahamas 
MArsHALL A. Howe 
Since the publication of the autho-’s contributions to Brit- 
ton’s Flora of Bermuda (1918) and Britton and Millspaugh’s 
The Bahama Flora (1920), further collections in Bermuda by 
Dr. A. B. Hervey and in the Bahamas by Mr. L. J. K. Brace 
and more critical studies of material previously collected have 
resulted in the recognition of four species that are apparently 
new to science, one Bermudian and three Bahamian, and in 
the determination of three more species not before attributed 
to the Bahamas. The species proposed as new are a Pithophora 
(family Cladophoraceae) from Bermuda; from the Bahamas, 
a Protoderma (?) (family Chaetophoraceae), a Chondrocystis 
(family Chroococcaceae), and a Dichethrix (family Rivulariaceae). 
The diagnoses follow: 
Pithophora heterospora Howe & Hervey, sp. nov. 
Filaments oe intertangled, dark green, m. lon 
rhizoid and proximal cauloid parts often not well differentiated. 
the rhizoid rain occasionally developing cauloid branches an 
the cauloid parts sometimes emitting rhizoid iene, special 
haptera or helicoids not seen; main fertile cauloid filaments 
eens Poe: 56 wu (45-90 uw) in diameter, the branches com- 
only of o 
as long as broad, those of the ultimate branches often 30-53 
times as long as broad, the cell walls 1.5~3 w thick; rhizoid part 
rarely unicellular, usually equaling and SD iailar to the cauloid 
in size and ramification, the cells often somewhat: more ar 
: ; ‘: 
cauloid and rhizoid parts, mostly intercalary, occasionally 
terminal, those of rhizoid and proximal cauloid —, hota etd 
geminate, or more often 3-5, sometim ape? Aas to 10-22, in a con- 
catenate series, polymorphic, mostly cask-shaped to ubelatce 
and 130-182 uw X 80-143 wu, occas Brea fusiform-clavate or 
somewhat pestle-shaped and up to 286 yu long, sometimes 
branched, the terminal sh pe pene or ellipsoid, subacute, 
apiculate or subrostrate, and distal ae — 
soid. ficou I-14.] 
351 
