|Fiom the BULLETIN oF THE ‘TORREY BoTanicar CLUB, 33° 577-580. 1yv6.] 
Two new coralline algae from Culebra, Porto Rico 
M. Fosiiz AND M. A. Howe 
(WITH PLATES 23-26) 
Since the publication of our paper on ‘‘ New American Coral- 
line Algae,’ * the island of Culebra, lying between Porto Rico 
proper and St. Thomas and now occupied by the United States as 
a naval ‘station, has been visited by a collecting party from the 
New York Botanical Garden. Several coralline algae were secured 
there, including two rather large and conspicuous kinds which are 
quite different from any hitherto reported from the West Indian 
region and are, we think, entitled to characterization as new species. 
Descriptions of these two species are herewith given: 
Goniolithon acropetum Fos!. & Howe, sp. nov. 
Attached by a rather inconspicuous hypothallus and forming 
cespitose or difform masses mostly 4-12 cm. high, the single 
clusters usually 6-15 cm. in diameter, but often confluent and 
apparently larger; branches repeatedly subdichotomous, much 
anastomosed, compressed or subterete, 1.25-3-10 mm. in diam- 
eter, and subtruncate-capitate, or very often much dilated either 
at apex only or throughout and then forming flabella or foliar 
laminae 10-25 mm. broad (including anastomoses) and 1-2 mm 
thick or commonly thicker in basal parts, the dilated portions 
os anastomosing in such a way as to form somewhat tubular or 
subinfundibuliform communicating interstices, the terminal flabella 
younger branches all conspicuously decutescent, the exfoliations 
Papyraceous, revolute, and more or less concentric or zona e: 
se 2X 9-14, heterocysts numerous ; conceptacles of spo- 
Fangia subconical becoming mammilliform, about 1 mm. in diam- 
eter; sporangia 4-parted, go-168 2 X 40-102 p. (FIGURE I and 
PLATES 23, 24. ‘ 
a Growing on corals and on other Melobesieae in about 1-4 dm. 
Water (low tide) in a reef-sheltered cove near the mouth of ie 
peer ee See Soe 
* Bull. N. Y. Botanical Garden 4: 128-136. pl. 80-93-17 Mr 1606. 
577 
