GENERA MICROSTYLIS AND MALAXIS. 851. 
longa vix unciam lata; scapus 2]-uncialis subflexuosus teres ; 
bractex lanceolate acuminate, superiores 4 mm. longe; flores ad 
13, parvi: virescentes tenues; sepalum posticum lineari-oblongum 
obtusum, lateralia subsimilia obliqua; petala linearia labellum 
oblongum subspathulatum, apice rotundatum, marginibus minute 
dentatis, callis cariniformibus duobus brevibus ad basin ; columna 
eycnicollis gracilis, stelidiis brevibus truncatis; capsula erecta 
ovata oblonga, 1-uncialis. 
Ceylon: Haragala, Dr. Trimen! Herb. Brit. Mus. 
Srupies ın VÉGETABLE Bıorogy.—IV. The Influence of Light 
upon Pfotoplasmic Movement, Part II. By SPENCER LE 
M. Moonzz, F.L.S. 
[Read 19th January, 1888.] 
(Puates XIIL-XV.) 
The Movements of the Chlorophyll Bodies of Selaginella Martensii, 
Spring, with some Notes on Positive and Negative Fragmen- 
tation of Chlorophyll. 
PritLievx* discovered that the large undivided chlorophyll body 
arranged in the shape of a saddle in the lower part of each 
upper epidermal cell of Selaginella Martensii leaves assumes a 
lateral position when the plant is brought up to sunlight, some- 
times suffering fragmentation during the process. Beyond 
noting that several other species of the same genus share this 
peculiarity, Prillieux did nothing whatever; and as no attempt 
has since been made to grapple with the problems involved in 
this movement, it is proposed to deal with the subject here. 
The tetrastichous, and at first imbricated, leaves of the hetero- 
morphie Selaginellas are, as is well known, of two kinds, those 
of the two upper rows—turned towards the source of light— 
being markedly smaller than their lower-lying fellows. Each 
leaf has an upper and a lower face; and since the long axis of 
the small leaves runs very nearly parallel to that of the stem, 
each small leaf has a right and a left edge; but the two edges of 
the large leaves are fore and hinder, since the long axis of these 
is, from an early period, at or nearly at right angles to the stem’s 
* Comptes Rendus, tome lxxviii. 
LINN. JOURN.—BOTANY, VOL. XXIV. 2r 
