ON THE IjAMINAK.IA.CEAE OF HOKKAIDO 
3 
According to the result of the present study on the Laminaria- 
ceae of Hokkaido, Kjei-i.man’s system is in need of a little amend- 
ment in some respects. Namely, Kjellman classified Costaria in 
the Laminarieae stating that it lacks cryptostomata. However, 
that organ has been discovered in specimens of Costaria Turneri at 
hand. On the basis of the character of the paraphysis, the genus 
Costaria is to be placed between the subfamilies Chordeae and 
Alarieae. 2 ^ 
2) In modem systems, the kelps or the Laminariaceous plants are placed in one 
order, Laminariales (cf. Kylin, 1917, p. 308; Oltmanns, 1922, p. 121; Sstchell and 
Gardner, 1925, p. 590h The Laminariales are classified into two families, viz., C'norda- 
ceae Dumortier (1822) and Laminariaceae REICHENBACH (1828), in the systems arranged 
by several authors, such as Oltmanns, (1922), Schmidt (1938), and Okamura (1936) ; 
or into five families, viz., Chordaceae, Laminariaceae, Lessoniaceae Setch. et Gardn., 
Alariaceae SETCH. et GARDN., and Haligeniaceae in the system proposed by SETCHELL 
and Gardner (1925) ; or into four families, viz., Chordaceae, Laminariaceae, Lessoniaceae, 
and Alariaceae, in the system adopted by PAPENFUSS (1951, p. 150). As enumerated 
by PaFENFUSS (l. c.), the Laminariales of the world contain at present thirty-one genera, 
of which fifteen genera have been reported from Japan and adjacent waters. Their 
names and classification are as follows ; 
Order Laminariales Kylin, 1917. 
Family 1. Chordaceae Dumortier, 1822. 
Chorda Stackh., 1816. 
Family 2. Laminariaceae REICHENBACH, 1828. 
Subfam. 1. Laminarieae BORY, 1822. 
Laminaria LAMOUR., 1813. 
Kjellmaniella MlYABE, 1902. 
Subfam. 2. Cymathaereae Setch. et Gardn., 1925. 
Cymathaere J. Agardh, 1867. 
Subfam. 3. Agareae KÜTZING, 1843. 
Agarum BORY, 1826, emend. POST, et Rupr., 1840 
Costaria Greville, 1830. 
Thalassiophyllum POST, et Rupr., 1840. 
Subfam. 4. Hedophylleae Sstchell, 1912. 
Streptophyllum MlYAEE et NAGAI, in NaGAI, 1940. 
Arthrothamnus Ruprecht, 1848. 
Family 3. Alariaceae Setch. et Gardn., 1925. 
Subfam. 1. Alarieae SETCHELL, 1912. 
Alaria Greville, 1830. 
Pleuropterum MlYABE et NAGAI, 1932. 
Undaria SURINGAR, 1873, emend. OKAMURA, 1915. 
Subfam. 2. Ecklonieae SETCHELL, 1912. 
Ecklonia Hornemann, 1828. 
Eisenia Areschoug, 1876. 
Eckloniopsis OKAMURA, 1927. 
