Collins and Howe: Species of Halymenia 179 



part, obconic or clavate-truncate and 2-5 times higher than 

 broad, their outer walls gelatinous or deliquescent; tetrasporangia 

 (protoplasts) 14-26 /z X 12-14 /z, the spores decussately paired; 

 cystocarps unknown. 



Bermuda: W. G. Farlow, 1881; Green Bay, W. S. WadswortJi, 

 February, 1890; Castle Harbor, near Tucker's Town, F. S. Collins 

 7075, April 25, 1912; Walsingham, A. B. Hervey, January 15, 1915 

 (Phyc. Bor.-Am. 20Qq). 



Type: Walsingham, A. B. Hervey, January 15, 1915, in herb. 

 F. S. Collins. 



Halymenia pseudofloresia differs from both H. Floresia and H. 

 Gelinaria in its normally deeper red color, in the firmer sub- 

 coriaceous texture and verruculose surface of its older fronds, 

 and in the mostly clavate-truncate and much elongate superficial 

 cells of the older parts of its frond. From H. Floresia, which 

 apparently occurs in southern Florida and the West Indies, as 

 well as in the Mediterranean and adjacent regions, it differs also 

 in the less deeply dissected frond, with the teeth or ultimate 

 lobules mostly acuminate-deltoid from a broad base rather than 

 mostly lanceolate, ligulate, or ciliiform from a somewhat con- 

 stricted base. Lanceolate outgrowths from a narrowed base are 

 of occasional occurrence, but such seem to have more the habit 

 and nature of proliferations than of normal lobes and lobules. 

 From Halymenia Gelinaria, H. pseicdofloresia differs furthermore 

 in its more lobed and dissected and more obviously pinnate frond 

 and in its firmer, less distinctly filamentous cortex. 



The older parts of Halymenia pseudofloresia, at least as shown 

 in the Walsingham specimens collected by Hervey, are infested 

 by four or five kinds of endophytic algae, and we have sometimes 

 suspected that the small verrucae referred to in our description 

 as occurring on the old fronds might be caused by irritation due 

 to their presence. However, most of these verruculae appear 

 to be free from any endophyte and we have thought best to treat 

 them as more or less normal parts of the old frond. We have not 

 observed any tendency of these verrucae of the general surface 

 to develop into proliferations, even though the marginal pro- 

 liferations commonly spring from somewhat similar outgrowths. 

 These surface verruculae are dense, dark red, and about 0.2- 



