Vol. 28 



No. 6 



BULLETIN 



OF THE 



TORREY BOTANICAL CLUB 



JUNE 1901 



Observations on the Algal Genera Acicularia and Acetabulum 



By Marshall A. Howe 



(With Plates 24 and 25) 



I. Acicularia Schenckii (Mob.) Solms 



1. Historical. — The material from which Acicularia Schenckii 

 was originally described came from Cabo Frio, Province of Rio de 

 Janeiro, Brazil, where it was collected by Professor H. Schenck in 

 May, 1887. It was first made known under the name Acetabularia 

 Schenckii by Dr. M. Mobius in Hedwigia for 1889 (28 : 318-320. 

 pi. 10. f. 8—12). But in this species the aplanospores surround 

 themselves each with a thick calcareous shell and these shells 

 adhere, so that the aplanospores, by the decay of the sporan- 

 gium wall, are left in a single coherent mass, retaining more or 

 less the form of the sporangium ; and on this ground, Graf zu 

 Solms-Laubach in his Monograph of the Acetabularieae, published 

 in 1895,* refers the species to the genus Acicularia, previously rec- 

 ognized only in the fossil state. The genus Acicularia was founded 



t 



Middl 



seloup pres Pavant." It was referred to the animal kingdom by 

 d' Archiac. and this opinion as to its nature was generally held until 



* Trans. Linn. Soc. Bot. II. 5: 1-39.//. /--/. 



f d' Archiac. Description geologique du Department de TAisne. Mem. de la 



Soc. geol. de France, $ 2 : 386. //. 23. f. 8. 1843. 



[Issued June 19th] 321 



