486 
PEOFBSSOE HEKFEET ON THE ANAT03IT OF TICTOEIA EEGIA. 
same time directed to the pecuHarity of the position of the flower-stalks fonm^ a sprml 
sel midway between the turns of the spirals of the leaves, wr.h each pedunde remov^ 
to one side o^ the axil of its subtending leaf. An examination of the termmal bud of 
the rhizome rendered the relations of these parts clear to me. The leaves are an-ange 
according to "the formula i- e. each succeeding leaf stands „ parts of the cnrcum- 
Znce of the stem to one side of its predecessor; hence thirteen turns are made round 
the stem before a leaf appeai-s immediately over any given one taken as a startmg-pom . 
Ind this leaf is the twenty-second in order of development from that taken as ze^ 
In this arrangement numerous secondaiy spirals are foimed accor^ to the wen-known 
laws of phyllotaxy. The mode of succession of the leaves is 
representing the upper end of the rhizome viewed from above (Plate XX^dll. fi„. )■ 
In the vegetatimh the origin of the leaves and peduncles was readdy seen with 
a moderate magnifying power (Plate XXIX. fig. 5; XXX. fig. 27). ac e anses as a 
conical papilla, vei^ soon presenting three lobes, the midiUe one being t e » « ° ^ 
leaf and the two lateral the two points of the double axiUarj' stipule (fig. 2 1 ? , s, b). 
Very soon the blade of the leaf becomes distinctly bounded below by a constricted poition, 
and a ridge arises running across its inner surface from one stipule to the other; as the 
parts increase, this ridge rises up and forms the membranous axillary portion of the doii e 
stipule standing inside the petiole. The petiole soon becomes distinguishable and as i 
elongates it removes the blade more and more from the axillaiy stipule. The giadua 
evolution of the blade of the leaf, with its cmious im-oUed vernation, was traced, but 
demands no special attention, except the remark that the general plan of vernation 
consists of the rolling in of the edges towards the centre ; but there is a complication m 
the details from a wrinkled or ‘corrugated’ condition of the parenchyma m the aieo . 
between the anastomosing ribs. In the specimen I examined, which was "T 
covered with flower-buds, these latter were found of every size, chmmishmg to a conical 
papilla in the punetmn vegetationia (Plate XXX. fig. 27), but only t e leiy yomi^e- 
that could be dTstinguished stood in the axil of its subtending leaf. lA hm-e riiis existed 
the nascent organs were in absolute contact. As soon as they become at all sepaiated 
by the expansion of the apex of the stem on which they arise, the flower-bud is cailied 
away from the axil and takes its position, where it permanently remains, m the 
right-hand half of the double stipule (Plate XXIX. fig. 5,/I,/2; ' 
This is the real explanation of the apparently anomalous position o t le oueis 
to in my former paper. , , . a , fiv^v 
The stipules deserve some notice, both from their size and then con i ion. - s .. 
enlarge with the development of the growing axis, they do not become de le e on ) a 
constricted base, but extend on each side of the petiole and form a sheathing structme 
which reaches at first nearly all round the stem (Plate XX’VIII. fig. 4), and ultima t ) 
about one-half or one-third of its circumference. This broad base is continuous belou 
with a rounded projection of the cortical structure of the stmi, and it is 
projections that the transverse plates of solid tissue aie tonne la o 
