1918] DUFRENOY—PINE NEEDLES 441 
P. maritima? In normal needles, however, it is restricted to a few 
elongated vessels, sparsely distributed among pitted cells, from 
which they can be easily differentiated. They are always asso- 
ciated with peculiar elongated vessels which stain a bright orange 
with Sudan III (figs. 1-4). Tumors of Coccus resinifians, n. sp.’ 
however, may result in the reversion of the vascular strand in the . 
infected needles to the cycad structure, through the development 
Pai > 
ae 
iw 
Fic. 4.—Part of periderm of young juvenile leaf —— May gl p, phloem, 
with eetilins rays (m) crowded with resin drops; rmal wood; s, inverse wood in 
transfusion sheath, staining orange with Sudan TI, e, pales Mahe 
of a well defined bundle of inverse wood, which may often extend 
from the ventral face of the protoxylem to the endodermis (figs. 
§=10)/ 
2. RELATION OF PINES TO FERNS.—Other tumor-infected needles 
show phloem differentiating on the dorsal side of the inverted 
2, Van TIEGHEM considered the transfusion sheath on the ventral side of normal 
wood in pine needles to be the homologue of the “inverse wood”’ in the petiole of 
cycads. Following Takepa (19), we found this untenable. 
3 This Coccus has been recorded by DurrENoy from stem tumors of pines, but the 
name was omitted from the note (13). 
4Stomatal anatomy also emphasizes the origin of a. and pines from a com- 
mon stock (REHFOUS 18). 
