~ 
68 EAST AFRICAN PLANTS. 
of reste gerne cells in which the undulated liber-zone is plunged ; 
this is followed by a series of air-canals, inside which is seen a secon 
ayer of fusinifedus cells, and then a second Bhevesoue 3 in course of 
formation accompanied by a second series of air-canals. M. Marchand 
shows that splitting of the bark takes place along - line of the air- 
canals, the cells of the outer portion of the paren chymatous mass in 
the midst of which the liber-zone is plunged now | osing their resinous 
contents and becoming the ‘“‘ pseudepidermis.’ 
The structure of the bark of Boswellia Hen gees (fig. d) i 
somewhat different. Starting from without inwards one sees first a a 
false suberous layer, in whi i are plunged Siber-layers and air-canals 
s,a',l'). Then there is a mass of rounded cells filled with resin, 
ed by a great number of more or less transversely extended 
resiniferous cells, among which are air-canals and layers of liber (b); 
the latter are not undulated as in the cases figured by M. Marchand, 
but they extend round the stem in “interrupted peed. 8 = eee 
indeed, isolated liber-cells are m 
hose already allu 
ot 
E. 
S 
zB 
a 
- 
@ 
® 
5 
= 
by air-canals and eget A eae of ‘the periodical 
nk osis, Ovario ovoideo crus tose glabro 2-loculo, stylo brevi crasso, _ 
ate — whence ee capsula globosa. 
Bm In pratis siccis ins. Z anzibar No. 1 
Terr Bil goad ania n.s sete lignoso erecto 
aivarieaty lanato-tomentoso dem: m pubescent, foliis alternis hac atque 
ongestis sessilibus oblongo-line aribus tiusculis basin versus 
mansieis ra strigoso-hirtis une. omg circiter une lat., 
calyce ba angulato inauriculato segmentis linearibus strigoso- 
villosis } ree long, corollz sinubus one lobis Sates cireiter 6-plo 
superantibus lineari-lanceolatis 
natis additamentis oe dimidio leakiptiinta, ovaril Tobie e gynobasi 
Jeviter convexa promin entibus, nuculis igen levi ter triquetris ad 
latera glochidiatis facie inferiore gynobasi adna 
Hab.—Ad * ‘ Serrusgebinge ” ditione Roraatcans 1800 met. No. 
US ZANZIBARICUS, s. Moore, n.sp.—Caule debili glabrato 
