A REVISED LIST OF CORALLINiE. 23 



There are, however, numerous species which have the normal 

 conceptacles at the external margins of the articuli, displaying, 

 in a manner, the link between the Eucheilospormn and the 

 Alatocladia. Cheilosporum yessoense and C%eil. latissimum are 

 the best examples. Cf. PI. II. figg. 12 and IG, "Cor. ver. 

 Japon." We should find some difficulty in reckoning the former 

 species under the Alatocladia, had not some conceptacles been 

 found on the flat surface of the articuli, before examining a 

 microtome section of a conceptacle. 



The sharp boundary between the two sections above men- 

 tioned is by no means easily delineated. In practice, however, 

 we can distinguish them with the utmost safety by the size of 

 the frond, the shape of the articuli and the locality of the plants. 

 Almost all of the Eucheilospoi'um are inhabitants of warmer 

 climates : the articuli are sagittate with sharp pointed wings ; and 

 the height of the frond hardly exceeds a few inches. These 

 characters are of-course arbitrary and may not be clearly ascer- 

 tained in some intermediate forms. Still they are often useful in 

 determining a sterile plant. 



Setchell and Gardner, ^^ after their long study, hold the 

 opinion that Clieil. frondescens, etc., must be united to the formée 

 of Amp. tuberculosa Endl. The present writer wishes to be 

 allowed to add a few words concerning their view. 



Cheilosporum (Amphiroa) tuberculosum is a peculiar plant. 

 It has the characters of both the Arthrocardia and the Alato- 

 cladia in the external as well as in the internal points. Decaisne'^ 

 has already noticed that it belongs to the section Arthrocardia 



1) Alg. N. W. Am. p. 360. 



2) Memoir, p. 110. 



