92 Howe : Phycological studies 



Acetabulum polyphysoides (Crouan) Kuntze, Rev. Gen. PI. 2 : 



88i. 1891 



Acetahularia polyphysoides Qro\xdLX\\ Schramm & Maze, Essai 

 Alg- Guad. loi. 1866; Maze & Schramm, Essai Alg. Guad. 84. 

 i^jo-yj {iiomen saninuditni)\ — Solms, Trans, Linn. Soc. Bot. 

 II. 5 : 29. //. ^.f. 2, 6. 1895 ; Vickers, Phyc, Barbad. i : pL 4J. 

 1908. 



Plants small, short-stalked, 2-^ mm. high, light green, rays 

 of the disc little calcified except in the contact-areas, the interradial 

 lime-masses shorter than the rays and inconspicuous (sometimes 

 almost wanting) or slightly projecting at the margin with flabelli- 

 form or inversely deltoid apical expansions : disc nearly flat or cup- 

 shaped, solitary, 2-5 mm. in diameter, the margin subentire or 

 stellate-dentate ; sporangia (rays) 11-25 (nnostly 11— 18), varying 

 from inflated-obvoid and about twice as long as broad to clavate- 

 cylindrical or subfusiform and 3-5 times as long as greatest width, 

 rather easily separable and often more or less free, rounded-obtuse 

 at apex or obtusely taper-pointed, obtusely subrostrate or bluntly 

 subconical ; coronal processes knob-like, oval-elliptical in surface 

 view, 75-150 //in longest (radial) diameter, each bearing 5-13 

 (usually 8-10) hairs, hair-rudiments, or hair-scars arranged in an 

 elliptical manner ; hypopeltal processes wanting : aplanospores 6 

 —50 in a sporangium, globose, ovoid, or ellipsoid, 88—190 fi in 



m 



5-0.70 mm 



Ho 



[Plate 6, figures 16-20; plate 7, figures 5 



Low littoral to at least 4-5 m. of water. Pointe-a-Pitre, Guade- 

 loupe, Maze; Atwood Cay, Bahamas, Howe ^jio, 3212 ; Mal- 

 colm Road, Caicos Islands, Howe ^6j2 ; Castle Island, Bahamas, 



^'e ^yjia; Montego Bay, Jamaica, Hozve ^02gb. 



Acetabulum polyphysoides deltoideum forma nova. Spor- 

 angia (rays) mostly 7, vesicular-inflated, inversely deltoid or obo- 

 void-deltoid when viewed from above, about as broad as long ; 

 coronal processes with 6-8 hairs or hair-rudiments. [Plate 6, 



figure 21 ; PLATE 7, FIGURE ID, 



Low littoral, with Neoiueris Cokcri and Acctahdiim polyphy- 

 soides^ Atwood Cay, Bahamas, Hoive S3^^^ December 4, 1907. 

 Only six or seven plants of forma deltoideinn were found ; they 

 were growing intermingled with our JJ/o (see plate 7, figure 9), 

 which we are referring to A. polyphysoides without a distinctive 

 form name, even though the rays are commonly narrower and 



