Brackish-Water Algae from Hawaii— Abbott 
Grateloupia C. Agardh, 1820: 221 
Grateloupia filtcina (Wulfen) C. Agardh, 
Syst. Alg., 241, 1824. 
Grateloupia filicina forma hawaiiana Mazza, 
Nuova Not., 26: 75, 1915. 
Plants purplish-red, cartilaginous, 14 cm. 
in height, erect, the fronds attached in 
groups by a single holdfast; branching with 
a percurrent main axis, the whole plant as¬ 
205 
suming a pyramidal shape. Branches to 3 
mm. in diameter, linear, acuminate. Me¬ 
dulla composed of spherical cells of mod¬ 
erate size in transverse section, occasionally 
showing stored dextrin particles, surrounded 
on the outer surface by two layers of com¬ 
pact small cells. Plants collected are sterile. 
Found in Keawanui, near pond gate in 
quiet water, with much epiphytic Erythro- 
trichia carnea. 
Fig. 7. A. Gracilaria coronopifolia J. Agardh. Cross section of thailus. Scale A (divisions 100 mi¬ 
crons). B. W'urdemannia miniata (Drap.) Feldmann et Hamel. Cross section of thailus. Scale C 
(divisions 10 microns). C. Hypnea nidulans Setchell. Cross section of thailus. Scale B (divisions 50 
microns). D. Hypnea nidulans Setchell. Cross section of portion of fertile branch showing tetra- 
sporangia. Scale C (divisions 10 microns). 
