Vol. 34 No. 10 
| BULLETIN 
OF THE . 
| TORREY BOTANICAL CLUB 
OCTOBER, 1907 
Phycological studies —III, Further notes on Halimeda and 
Avrainvillea 
MARSHALL AVERY Howe 
(WITH PLATES 25-30) 
A. ON THE SPORANGIA OF HALIMEDA ‘TRIDENS AND OF 
HaALIMEDA TUNA 
The sporangia of the genus /Yalimeda were for many years 
known only in the single species Halimeda Tuna,* though in 1876 
Zanardini + briefly described those of H. macroloba and in 1880 
Schmitz { contrasted the characters of the sporangiophores of 
falimeda Tuna with those of H. platydisca. But the true Hal- 
meda platydisca Decaisne, according to the original preserved in 
the Muséum d’Histoire Naturelle of Paris, appears to be simply a 
large form of H. Tuna,§ and whether Schmitz was really dealing 
with two distinct species or with two forms of H. Zuna is not 
altogether clear, In 1904, Mrs. Gepp || described and illustrated 
in detail the sporangia and sporangiophores of Halimeda gracilis 
*Derbés & Solier, Suppl. Compt. Rend. 1: 46, 47. pl. rz. f. 18-22. pl. 12. f. 
I-5. 1856, 
_ Bompard, Hedwigia 6: 129. 1867. 
Zanardini, Mem. R. Ist. Ven, 19: 541-543. A/. 70. 1876. 
tT Zanardini, /. c. 543, : 
as Sitzungsber. d. niederrheinischer Ges, f. Natur- und Heilkunde 1880: 140-146. 
@ Barton, E.S. The genus /alimeda. Siboga-Expeditie, Monographe 60: 14. 
1901. The present writer, after examining the same type, concurs with the monog- 
Tapher of ‘The genus Halimeda”’ in the opinion that 4. p/atydisca does not offer 
4ny satisfactory characters in form or structure to distinguish it from 4. Zana. 
|Gepp, E.S. The sporangia of Halimeda, Jour. Bot. 42: 193-197. pl. g6z. 
1904. 
[The BuLLeTIn for September, 1907 (34: 445-490) was issued 19 O 1907.] 
