123 



Vidalia obtusiloba (Mert.) j. Ag. 



Norrii Jap. ; Kaeri-nami. 

 PL. CXXXI. 



Vidalia obtusiloba (Mert.) J. Ag. Sp. Alg. II, 3, p. 1 123 ; Falken- 

 berg Rhodom. p. 429 (non Bornet) ; De Toni Syll. Alg. IV, p. 1102. 

 Rytiphloea obtusiloba Ag. ; Kg. Sp. Alg. p. 846. 



Only one specimen now before us. Frond rising from a 

 circular disc, linear, with the midrib thickened below into a short 

 stem-like, winged portion, 6.5 cm. high, 4-6 mm. broad, flat, 

 undulated and serrato-dentate at margin. The midrib more or less 

 thickened for the most part becomes fainter upward, with very 

 patent and faint veins extending alternately from the midrib to 

 marginal teeth. Branches standing in 2-3 times pinnate and alter- 

 nate manner, arise from margins as well as proliferate from the 

 midrib and are slightly narrowed at the base, ending in roundish- 

 obtuse in-rolled apices. On unfolding the inrolled apex of a branch, 

 the growing apices of lateral branches and finger like young 

 marginal teeth are displayed, all of which are strongly incurved 

 to the ventral side of frond. Marginal teeth become obsolete in the 

 lower portions of branches or assume deltoid shapes. When young 

 they are fine and subulate, strongly involuted, scarcely i mm., 

 long in the longest one, and in a fructified frond stichidia are 

 produced in them. Stichidia formed in pinnules of pinnately lobed 

 and siibmultifid teeth, linear, containing a double row of tetra- 

 sporangia. The midrib is much thickened on the ventral side, to- 

 ward which curve the apices of branches and marginal teeth. On 



PL. CXXXI CXXXV, February, 1915. 



