92 Howe : Phycological studies 



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



88i. 1891 



Acetabularia polyphysoides Crouan ; Schramm & Maze, Essai 

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

 1870-77 {iionien seniiiinduni); — Solms, Trans, Linn. Soc. Bot. 

 II. 5 : 29. pi. 4../. 2, 6. 1895 ; Vickers, Phyc. Barbad. I : //. 4.7. 

 1908. 



Plants small, short-stalked, 2-7 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 (mostly 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 n in 

 greatest diameter : stipe usually much corrugated, often enlarged 

 in the upper part, reaching a maximum diameter of 0.35-O.70 mm. 

 [Plate 6, figures 16-20; plate 7, figures 5-9.] 



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

 loupe, Maze; Atwood Cay, Bahamas, Hozve ^jio, 5212 ; Mal- 

 colm Road, Caicos Islands, Howe ^6§2 ; Castle Island, Bahamas, 

 Hoive 573111 ; Montego Bay, Jamaica, Hozve 502gb. 



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 io.] 



Low littoral, with Neoiueris Cokeri and Acetab?i/wn polyphy- 

 soides, Atwood Cay, Bahamas, Hozue jjii, December 4, 1907. 

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

 were growing intermingled with our SJio (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 



