F. Børgesen: Phæophyceæ of the Danish \Y. Indies. 



49 



]y[me Weber-van Bosse points out that P. auslralis Hauck 

 is very nearly related to this species and from my own observa- 

 tion that the frond of Padina gymnospora is distromatic in the 

 upper part of the thallus this relation is yet more evident. 

 Regarding P. australis Hauck 1 ) himself says: "Der Blattkörper 

 besteht jedoch bis zur Basis nur aus zwei Zellenlagen", but 

 M me Weber has also found specimens with three layers of cells. 



Padina gymnospora occurs in the littoral and upper sublittoral 

 region and is found both in more sheltered and in quite exposed 

 places. It has been collected with tetraspores in the months 

 Dec. — March. 



It has been gathered: St. Thomas, in several places in the harbour; 

 St. Croix: Cane Bay, North Side; St. Jan: Cruz Bay. 



Geogr. D ist rib. West Indies. 



3. Padina variegata (Lamx.) Hauck. 



Hauck, F., Ueber einige von I. M. Hildebrandt im Rothen Meere und 

 Indischen Ocean gesammelte Algen (Hedwigia, vol. 28, 1887, p. 42). Küt- 

 zing, F., Tabulæ Phycolog., tab. 73, fig. II. Vickers, A., Phycolog. Barba- 

 densis, part II, pi. VIII. 



Dictyota variegata Lamx., Expos, des caractéres du genre Dictyota 

 (Journ. de Bot., t. II, 1809, p. 40). 



Zonaria variegata C. Agardh, Species Algarum, vol. I, 1823, p. 127. 



Fig. 31. Fig. 32. 



Fig. 31. Padina variegata (Lamx.) Hauck. 



Part of the thallus showing the mutual arrangement of the series of hairs 



and tetrasporangia. (About 1'I_>:1). 



Fig. 32. Padina variegata (Lamx.) Hauck. 



Part of the thallus with series of hairs and antheridia (the white zones). 



(About I 1 !,- : 1). 



') Hauck, F., Ueber einige von I. M. Hildebrandt im Rothen Meere und 

 Indischen Ocean gesammelte Algen ("Hedwigia", 1887, vol. 26, p. 44). 



Dansk Botanisk Arkiv, Bd. 2. Nr. 2. 4 



