140 HELMINTHOCLADE^. v. 



larly dichotomous from about an inch above the base, without lateral branches ; 

 the segments fastigiate, sub-corymbose. Axils all very obtuse. Apices blunt, 

 rounded or emarginate in the dried specimen. On removing the calcareous matter 

 with muriatic acid, the axis is seen to be composed of many very slender, cobwebby, 

 hyaline, long-jointed, cylindrical filaments, from whicli issue laterally toward the 

 outside the horizontal peripheric filaments whose apices constitute the continuous 

 surface of the frond. These are pedicellate or unbranched for a third of their 

 length, then forked, and afterwards excessively di-trichotomous, all the branches 

 fastigiate, composed of elliptical or globose cells, strung together like the beads of 

 a necklace ; the ultimate cellules exceedingly minute, and appearing dot-like even 

 under a high magnifying power. Colour when growing a pale pinky red, soon 

 changing on exposure, and fading altogether during the process of drying. The 

 dried plant is coated with a powdery, calcareous deposit, and white, except the ends 

 of the branches, which become green. The substance is soft, between gelatinous 

 and cartilaginous, and the plant rapidly decomposes. In drying, it adheres closely 

 to paper. 



I should not have ventured to refer my specimens as above, had I not received a 

 specimen of Professor Agardh's plant from that author himself, and found it to 

 agree with my Sand Key specimens in every particular. The differences in our 

 descriptions arise from liis having seen and examined dried specimens only. 



Plate XXXI. C. Fig. 1, tuft of Liagora leprosa, the natural size. Fig. 2, portion 

 of a branch ; Jig. 3, axial and peripheric filaments from the same ; Jig. 4, part of 

 one of the lesser branches of a peripheric filament ; Jig. 5, apex of a division of 

 the same ; the latter figures more or less highly magnijied. 



5. Liagora pulveridenta, Ag. ; "frond compressed, sub-canaliculate, terete 

 above, dichotomous, with many lateral proliferous branches, covered with a powdery 

 crust ; the apices divaricate, obtuse ; the younger ones purpurascent." J. Ag. Sp. 

 Alg. vol. 2, p. 427. KOiz. Sp. Alg. p. .538. 



Hab. Vera Cruz, Liebman. 



I am not acquainted with this species. 



