39 



renifonn lobes, assuming a flabellate outline, with patches of brownish 

 hairs on the undersurface. Sori produced near the line of innovation. 



Hab. On shells of Haliotis gigantia from the depth of 20 fathoms 

 at Boshii ; Enoshima. 



Description. Fronds decumbent, at first simple and renifonn, after- 

 wards and more usually torn up longitudinally into cuneate segments, 

 which are again and again lobecl in the similar manner and become 

 nabelliform. The lobes afterwards assume the shape like the original 

 frond, being slightly imbricated. Fronds attain the length of 3-4 cm. in 

 specimens now before us, and have the breadth nearly as much. The 

 lower portion of frond thickens when old, and in some specimens it 

 assumes an appearence somewhat like a stem. The upper surface of frond 

 is smooth, but the under surface is covered with huffy-coloured jointed hairs 

 which mostly arise from the basal portion. In some specimens, they are 

 also emitted near the upper portion in a somewhat concentric manner. 

 The frond is composed of two layers of cells which are arranged in a 

 single longitudinal row of an equal breadth in surface view. Cells of the 

 under surface are a little larger than those of the upper. Sori are found 

 not fully formed in the specimens now before me ; but some of cells beneath 

 the line of innovation are divided into 4-6 or 8 in double rows, taking 

 an appearence very much resembling to the sporangia illustrated in- J. 

 Agardh's Anal. Alg. Cont. I. tab. I Fig. 3-5. Colour yellowish-brown 

 when recent, becoming blackish in drying. Substance thin and mem- 

 branaceous and the plant does not adhere to paper in drying. 



Remarks : The form and habit of the plant in question are much 

 different from Chlanidote microphyUa, but the structure of frond, mode 

 of growth, and characters of the fruit are exactly those of this genus. 



Pachydictyon coriaceum (Holmes). Fig. 31-34. 



Syn. Glossophora coriacea Holmes I.e. no. 



This plant has been described by Mr. Holmes from the materials 

 collected at Enoura by Mr. K. Saida. Many j T ears previous to that, I 

 myself have also collected many specimens of this plant in several localities 

 and preserved them in my herbarium ; but unfortunately they were all 

 sterile specimens and so have been left undetermined. I have sent some 

 of these specimens to the late Prof. Fr. Schmitz labelled Dictyota Kunthii 



