148 RHODOMELACEAE 
Attached to a shell and washed ashore at Pisco, Coker 465 p.p., 
July 7, 1908. | 
The present species is perhaps mostly nearly allied to Streblo- 
cladia fasciculifera (Kiitz.) Falkenb. from the Cape of Good Hope 
(not Polysiphonia fasciculifera Kütz. Tab. Phyc. 13: pl. бт. f. а-а), 
but evidently is amply distinct in the spiciform rather than 
fasciculate grouping of its secondary and tertiary axes, in the 
shorter ultimate ramuli (14—14 as long), which are mostly recurved 
at the apex (forcipate-incurved in only the very youngest parts), 
and in having 10—12 pericentral siphons in the main axes instead 
of 14-18. In habit S. spicata is a little suggestive of strict slender 
conditions of Acanthophora spicifera (Vahl) Bórg., but is always 
much more slender and delicate. 
“ Polysiphonia Zimmermanni Suhr mscr." attributed to 
Callao, and cited by J. Agardh* in the synonymy of Polysibhoma 
thyrsigera and by De-Tonit in the synonymy of Bryocladia thyrsig- 
era, possibly belongs here, but we have no means at hand for 
proving it. Thenumber of pericentral siphons of the La Guayran 
Polysiphonia thyrsigera J. Ag. is essentially the same as in Streblo- 
cladia spicata and Kützing's figures (Tab. Phyc. 14: pl. 33. f. e, f.) 
show branches of somewhat similar form, but both descriptions 
and figures indicate that Bryocladia thyrsigera is a plant of mono- 
podial axes and accordingly of very different habit from that of 
Streblocladia spicata 
PLATE 56. Sireblocladia spicata 
A photograph of the type specimen (dried), natural size. 
PLATE 57, FIGURES 1-8. Streblocladia spicata 
т. A typical pinna. 
2. Apical portion of main axis. 
3. One of the lower pinnae. 
4. Cross sections of main axes 
5. Surface view of pericentral siphons in lower part of main axis. 
6. Pericentral siphons of the usual mature form in surface view. 
7, 8.  Apices of ultimate ramuli. 
The figures are all drawn from the type material (Pisco, Coker 465 p.p.). Figures 
1-3 are enlarged 28 diameters; 4-6, 40 TUM 7 and 8, 245 diameters. 
_ РЕАСОРНОВА A BINDERI J. Ag., а Rhodomelaceous epiphyte on 
* Sp. Alg. 2: 955. 1863. 
t Syll. Alg. 4: 967. 1903. 
