25 



JRCLVii H (S, 7-z< Q. 7: K > KM ffi, 7-8: # ** = -/ B& JB M * * 

 ***;;fl-t*fc;T5B3 ffliS =&**>> *-**, i*2.-9: #; 8K ; fl- IB 

 tt = M -a /> *, *. * * * *, = ; , 1^10 : *S ? S, if .-11-15 : Jte M W > ?1 / & 

 W; 3-5 Ita la fl& a K >v * Tjt * ; ^ ; 16 : S flft -y * -v 86 Jg W, aj a */>,?* 

 >/ > -ffiyBS.^^^*'i'*>', ^ 17-19 : *^JS8^OW;9^*i;l4 

 **-,,, iij.-20 : tt * -f t ^ - a =- 21 : tt * T, ii. 



Odonthalia semicostata (Mert.) J. Ag. 

 PL CLVII, Fig. 1-6. 



Od. semicostata (Mert.) J. Ag. Sp. Alg. II, p. 898 ; De Toni Syll. Alg. 

 IV, p. 1141. 



Fronds flat rising from scutate disc, broadly linear, 10-15 

 cm high, 3-5 mm broad in branches, much broader in the main 

 portion, often attaining 5-8 mm or more, decompound pinnate, 

 alternately dentate along both margins, traversed by more or less 

 flexuose faint midrib which evanescently disappears upward (in 

 Fig. i, the midrib is represented too distinctly) and thickens below 

 for a short distance like stem. Lacineae are dentate or deltoido 

 subulate, erect or parted in lower part, but subfalcate near apices 

 of branches. Veins running from the midrib to marginal lacineae 

 alternate faintly, but stand opposite here and there where branches 

 and lacineae oppose to each other. Ramuli arise in the axils of 

 lacineae, three or more in one row above an axil, often densely 

 aggregated, and some of them grow up into branches. Fruits 

 unknown. Color brick-red with purplish tint in dried state and 

 somewhat dusky. Substance membranaceous and the plant ra- 

 ther closely adheres to paper in drying. 



Hab. : floating 10 miles off the mouth of the Riv, Osernaya 



