IO4 



9 H = 



Polysiphonia Morrowii Harv. 



Nom. Jap, : Aloro-itognsa 

 PL, CXXVII, Fig. 1-8. 



Polysiphonia Morrowii Harv. in Gray's List of Jap. Plant, no. 

 5; Kutz. Tav. Phyc. Vol. XIV, p. 17, t. 47, f. a-b ; r .? (v/ith tetra- 

 spores); De Toni Syll. Alg. V, p. 960; TO,Sft p. 59- 



Fronds densely tufted, elongated, 10-25 cm. high, setaceous, 

 about 0.3 mm. thick, alternately decompound pinnate. Basal por- 

 tions of the primary branches are naked or provided with a few 

 hamatous simple or divided ramuli which are also scatteredly found 

 along the main segments. Pinnae alternate and linear in outline, 

 patent, densely pinnulated on all sides. Pinnules or ramuli short, 

 erect or erecto-patent, subulate, simple below, multifid above, and 

 often recurved. Articulations 4-siphonous and throughly ecorticated ' 

 length of articulations of the main segments 6-8 times as the 

 diameter, that of pinnae subequal to or a little longer, and that of 

 pinnules lint is ramuli, as half as the diameter. Telrasfores found 

 in fusiform stichidial ramelli densely arising in clusters in the axils 

 of ramuli, 3-4 arranged in a longitudinal row. Cystocarps borne on 

 the upper ramuli, urceolate with a wide ostiole, slightly crenulated 

 at the margin and almost sessile. Colour brown, becoming almost 

 black in drying. Frond does not adhere to paper in drying. 



