122 SPHAEROCOCCACEAE 
This species was based ona Peruvian specimen sent to Kiitzing 
by Bartling, with which, through the courtesy of Mme. Weber-van 
Bosse, we have been able to compare Dr. Coker’s plant. Kütz- 
ing’s first-published figure of the structure of the plant is more 
accurate and less schematic than his later one, but both figures of 
the cystocarp in section give the impression that the spores are 
in rather more regular and more elongate concatenate rows than 
they really are. The few cystocarps that occur on Dr. Coker's 
specimens are somewhat immature and each of the sporogenous 
filaments terminates in a long-clavate cell, from the apex of which 
the spores are abjuncted. In the more mature cystocarps studied 
by Kiitzing the spores adhere in irregular rows of 2-4. The 
sporogeneous filaments are more numerous and crowded than 
might be inferred from Kiitzing’s figures and the medulla of the 
thallus is commonly less homogeneous and more loose and vacuous. | 
Dr. Coker's plants are essentially tetrasporic, and it may be of | 
especial interest in connection with the “alternation of generations” 
which has recently been shown to characterize so many of the | 
Florideae, to remark that the only cystocarps seen Бу us occur ой | 
a proliferation from а tetrasporic plant.* It may naturally be | 
suggested that this proliferation owed its origin to the germination m 
of а tetraspore in situ. However, the same proliferation bears | | 
also a few sporangia, even оп the wall of one of Ше cystocarps | | 
but these sporangia have ап abnormal appearance, being com- | 
monly undivided, once divided, or irregularly divided; in only опе 1 | 
sporangium on this proliferation, have we noted the normal | 
zonate division. Elsewhere, in our material, the sporangia are | 
very regularly divided into the four spores in the zonate fashion. | 
PLATE 48. Trematocarpus dichotomus 
Photograph of a tetrasporic specimen (Coker 09641—írom liquid preservative)» 
natural size 
Trematocar pus virgatus Kütz., described from Peru, appears to ; 
be referable to Agardhiella tenera, q. v. 
— сс ния ae 
* Compare Rigg, С. B., & Dalgity, A. D. А note оп the generations of Poly- 
siphonia. Bot. Gaz. 54: 164, 165. f. г. 16 Au 1912. Also Harvey-Gibson, К. Jo 
& Knight, M. Reports on the marine biology of the Sudanese Red Sea.—I gae 
енді Jour. Linn. Soc. Bot. 41: 307, 308. Л 1913. And Svedelius, N. 
n Geschlech ee von Nitophyllum punctatum; ein Beitrag 2 
а rage des prie dites der Florideen. Ber. Deuts. Bot. Ges. 32: 106-116. 
PL 2 +f. І. 1914. 
