Bull. Torrey bot. Club, 28, 1901, p. 321. Acetabular ia Schenckii Mobius, 

 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 

 crenulata. They agree very well with the description of Howe 

 (1. 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 /i in 

 diameter. Corona superior and inferior have both rather thick walls and 



agree very well with the figures by 

 Solms (1. c. pi. 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. 

 (Mob.) Solms. (About SPh— 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 



Fig. 8. Acicularia Schenckii 



Fig. 9. Acicularia Schenckii (Mob.) Solms. 



A. Ends of rays. B. Corona superior with 



hair-scars. C. Corona inferior. 



Fig. A 10:1, fig. B and C 60: 1. 



