29 PRINCIPLES OF BOTANY, ETC. 
66.. Hollow, (fi cdo), without any pith within, 
and quite hollow. 
67. With separations, (septis transversis interstinc- 
tus), where either the pith or the hollow space is 
divine by thin partitions. 
68. Cork-like, (subcrosus), when the outer rind 
is soft and spungy, as inthe Ulmus suberasa. 
69, Rifted, (rimosus), when there are in the rind 
thin clefts. or chinks * 
§ 14. ! LeU 
Thetrunx,( iruncus ), isproper to trees and shr tbe | 
It is twofold: 1. Truncus arboreus, that has a crown 
of branches at top: 2. Truncus fruticosus, that has 
branches also below. ) 
5 15. 
‘The STRAW, (culmus ), is proper onlyto the Grasses : 
ihe kinds of it are pretty much the same with those 
of the stem. It is however commonly knotted (n= 
dosus), seldom knotless (encodosus), almost always 
simple (simplex), seldom branched (ramosus) y in 
some it is bristle-like (setaceus), without vagina, and 
therefore naked, .(mudus) ; or siirrounded by the va- 
gine of the” leaves (vaginatus ). For the surface, 
see § Gu event 
* The surface of the stem has also many varieties ; Sysco y) O. 
When a sort of stem occurs in plants which does not come 
under the above definitions exactly, we use the word su, asin 
the leaves, § 23, and in other parts of plants : accordin gly we 
say, caulis subaphyllus,. subteres, &c. that is, a. stem almost 
leafless, somewhat round, &c.: 
