248 ANATOMY OF THE GYMNOSPERMS 



Pits on the tangential walls of the summer tracheids rather numerous 

 but not very large or prominent. Resin cells few, 15 p. wide, 185 

 240 p, long. 



Tangential. Kays somewhat numerous, medium ; the cells chiefly equal, 

 rather uniform, oblong, more rarely oval and broader. 



4. * J. californica, Carr. 

 Juniper 



Transverse. Growth rings variable, more or less eccentric and often 

 coalescent. Summer wood thin, chiefly of 3-6 tracheids, not very 

 dense, passing somewhat abruptly into the broad spring wood. 

 Spring wood rather open, the tracheids squarish, the walls medium. 

 Resin cells numerous and conspicuous, chiefly in broad, open bands. 

 Medullary rays very prominent and resinous, i cell wide, distant 

 2-1 I, rarely 17, tracheids. 



Radial. Ray cells very resinous, more or less contracted at the ends, 

 equal to 5-7 spring tracheids ; the upper and lower walls medium 

 and entire or remotely pitted, becoming conspicuously thicker at the 

 ends of the cells ; the terminal walls thin, curved and entire or 

 straight, locally thickened or even coarsely pitted ; the lateral walls 

 with oblong pits, chiefly i, or in the marginal cells and low rays 2-4, 

 per tracheid. Bordered pits broadly elliptical, rather numerous, the 

 orifice rather large. Pits on the tangential walls of the summer tra- 

 cheids numerous and prominent, rather large, the orifice bell-shaped. 

 Resin cells about 12.5-20/4 wide, and many times longer, upwards 



Of 215 /A. 



Tangential. Rays low and rather broad, very resinous, the cells from nar- 

 rowly oval in the lowest rays to round or more rarely transversely 

 oval, chiefly round. 



A small tree rarely 6-9 m. high, with a trunk .3o-.6o m. in diameter. 

 Wood light, soft, very close grained and compact, very durable in contact 

 with the soil. 



Relative specific gravity 0.6282 



Percentage of ash residue 0.73 



(Sargent) 



Dry slopes and plains of the lower Sacramento River, southward through 

 the California coast ranges to Lower California ; spreading inland along 

 the coast mountains to their union with the Sierra Nevada, through 

 which it ranges northward as far as Kernville, descending to 2600 feet ; 

 desert slopes of Tehachapi Mountains, and abundant on the northern 

 foothills and on the seaward slopes of the San Jacinto and Cuyamaca 

 ranges (Sargent). 



From the Quaternary deposits (lowan ?) of the Klamath River, Orleans, 

 Humboldt County, California, in blue, sandy silt at a depth of 150 feet. 

 Material very slightly silicified and in a good state of preservation. 



