— 282 — 



Bull. Torrey bot. Club, 28, 1901, p. 321. Acetabular ia S 'chenckii Möbius, 

 Bearbeitung der von H. Sehenck 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 ll in 



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



agree very well with the ligures by 



Solms (1. c. 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 



„. 0 . . 7 . 6 7 7 .. describe them a little more in detail. 

 Fig. 8. Acicularia bchenckii 



(Möb.) Solms. (About 2 1 / 2 — l). 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 



c 



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

 A. Ends of rays. B. Corona superior with 

 hair-scars. C. Corona inferior. 

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



