KOEHLERIANI. 199 



a. Koelileriani. Folia quinata vel raro ternata. 

 Aculei, aciciili setoeqiie ad basin incrassati. 



The liubi Koelileriani resemble the Eaduloe in many 

 respects, and are sometimes distinguished from them with 

 difficulty. I am unable to point out any character which 

 will always prove trustworthy. The Radidce rarely, if ever, 

 have the strong aciculiform setae which connect the true 

 setae with the aciculi of the Koehleriani; neither is it at all 

 usual to find their prickles very unequal in size and length 

 or otherwise placed than on the angles of the stem. Also, 

 the old stems of the Radulce are rough like a file from the 

 presence of abundant low slightly conical tubercles from 

 which the aciculi, setae and hairs have fallen : in the Koehle- 

 riani those organs are persistent, but are usually broken 

 from the old stems so as to leave very short blunt prickles 

 in the positions occupied by the tubercles of the Radidce. 



