U — 
Bull. Torrey bot. Club, 28, 1901, p. 321. Acetabularia Schenckii Möbius, 
Bearbeitung der von H. Schenck in Brasilien gesammelten Algen. Hedwi- 
gia, Bd. 28, 1889, p. 309. 
A few specimens were found in a collection of Acetabularia 
erenulata. They agree very well with the description of Howe 
(l.c. p. 323—4). Specimens with gametangia were found, in which 
before decalcification the gametangia stuck together in the calcareous 
mass mentioned by Solms. The gametangia were about 70—80 y in 
diameter. Corona superior and inferior have both rather thick walls and 
Fig. 8. Acicularia Schenckii 
agree very well with the figures by 
Solms (lc. pl. 3, fig. 12 and 14); the 
first has two hair-scars one behind the 
other. The disc is flattened or a little 
bent upward. On the rounded apex of 
the rays a small apiculum is to be found 
in these specimens. 
While these specimens were found 
in shallow water growing on small shells 
and stones on muddy bottom together 
with A. crenulata, I have further found 
some very few individuals (Fig. 8) in 
deeper water and as these specimens 
seem to show a few differences I shall 
describe them a little more in detail. 
(Möb.) Solms. (About 21/2—1). The plants were of intermediate size; 
the largest I have seen had a disc about 
8 mm. broad. The length 
of the stipe varies from 1 
to 2—3 cm.; it is vigorous, 
rather thickwalled and has no 
spindle-shaped swellings. 
The disc is flattened; it 
has about 50 rather thin- 
walled rays which are all 
firmly united even after treat- 
ment with acid. The wedge- 
shaped rays end in a rounded 
apex which often quite lacks 
the small apiculum (Fig. 9 A). 
The corona superior and 
—— > ES, 
Robe on 
| 
Mey 
min 
IC 
Fig.9. Acicularia Schenckii (Möb.) Solms. 
A. Ends of rays. B. Corona superior with 
hair-scars. ©. Corona inferior. 
Fig. A 10:1, fig. B and C 60:1. 
