496 CALIFORNIA ACADEMY OF SCIENCES. 



large solid stone. That it should be still properly included 

 in the Uva-ursi group is apparent from the fact that it has 

 all the general characters of growth and foliage belonging 

 to that section, and that the solid stone is made up of co- 

 herent cells is shown by occasional lines of division, a sharp 

 blow on the outside frequently breaking it along regular lines 

 of separation. On the other hand the species heretofore 

 associated with A. glauca, viz. : A. hicolor, Gray, exhibits such 

 widely diverse characters of stem, foliage and general habit, 

 as well as a perfectly solid stone, showing no indications of 

 coherent cells, as to justify its re-establishment under the 

 original name Xylococcus bicolor, Nutt. 



