ALGiE. 165 



Gracilaria concinna, Sond. in Herb. T. C. D. 



Frond 2 or 3 inches high, from half a line to nearly a line in 

 breadth, compressed or nearly flat when dry, corrugated longitudinally 

 from shrinking, repeatedly and regularly dichotomous, with wide axils 

 and very obtuse and bifid apices ; the branches fastigiate. Substance 

 cartilaginous, rigid when dry. Color a dull greenish-purple, darker 

 toward the tips. Coccidia small, half sunk in the ramuli. 



Grateloupia Cutleri^e, Binder ; J. Ag. Sp. 1, p. 183. 



Irid^ea laminarioides, Bory ; Kiltz. 1. c. p. 726. 



Chondrus exilis, Harv. & Bail. (Tab. 6, fig. 1, 2.) 



C. p>usillus ; fronde v/nciali complanata anguste lineari crehre dlcho- 

 toma, axillis patentibus rotundatis, segmentis linearibus apicibusqiie 

 obtusis. 



Root scutate. Frond scarcely an inch high, from a quarter to half 

 a line in breadth, flat, linear, closely and repeatedly dichotomous, 

 with rounded axils and patent linear segments; the apices truncate 

 or very obtuse, sometimes retuse. Substance cartilagineo-corneous, 

 rigid when dry. Color, a dull brownish-red. 



Gymnogongrus dendroides, Harv. & Bail. Vide infra, p. 169. 

 Centroceras clavulatum, J. Ag. Sp. 2, p. 148. 

 Conferva ^erea, Dillw. Conf. ; Harv. Pliyc. Brit. £. 99. 

 Codium adherens, Ag. ; Harv. 1. c. t. 35. 

 Ulva Linza, Linn. ; Harv. I. c. t. 39. 

 Ulva latissima, Linn. ; Harv. I. c. t. 171. 



BIO BE JANEIRO. 



Sargassum vulgare, Ag.; J. Ag. Sp. l,p. 342. 

 Sargassum cymosum, Ag. ? (Sterile). 

 Padina Pavonia, Adam. ; J. Ag. 1. c. p. 113. 

 Dictyota Bartayresiana, Lamour. ; J. Ag. 1. c. l,p. 94. 

 Codium tomentosum, Ag.; Harv. Pliyc. Brit. t. 93. 



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