BADUL.E. 1G7 



d. Radulce. Caules punctis elevatis rigidis, ubi 

 setae aciculique breves suboequales sederunt, asperi effi- 

 ciuntur ; aciilei subsequales. 



The plants contained in this group have much in com- 

 mon. They may be known from the Spectahiles by having 

 an abundance of short and equal aciculi and setse on their 

 barren stems. When such arms are found on Sjyectabiles 

 they are inconspicuous, few, and scattered very irregularly ; 

 some intei'nodes bearing a considerable number, but other 

 parts of the stem totally wanting them. Here they are 

 tolerably uniformly and universally distributed. 



The Glaadalosi differ from these plants by having very 

 scattered prickles, which vary greatly in size, and decrease 

 gradually and insensibly so as to become undistinguishable 

 from aciculi, and the aciculi are similarly undistinguishable 

 from the set?e and hairs. Their largest prickles are not con- 

 fined to the angles of the stem. All these arms are persis- 

 tent, and therefore the old stems of the Glaiuhdosi are never 

 rough in the same way as those of the Radidce. Even in 

 those cases where they make the nearest approach to the 

 roughness of the Radulce, a careful examination will show 

 that the prominent points are not tubercles, but the some- 

 what cylindrical bases of broken and rather strong aciculi 

 and setae. The roughness of the stems of Radidce arises 

 from the permanent rather hemispherical bases of weak 

 aciculi and setae. 



