MR. H. BOLUS ON SOME CAPE ORCHIDS. 233 
assist in retaining it in the chink of the rock, until by germina- 
tion it had succeeded in anchoring itself securely. 
The figure given by Desfontaines in the ‘Acta Nat. Soc. Paris,’ 
shows the peduncles after flowering bending downwards in suces- 
sion—tbat is, away from the erect corymbose inflorescence. In 
the dried specimens which I have examined I have not detected 
any apparent lengthening of the peduncle after flowering. The 
lower pedicels in a corymb naturally are longer than the upper and 
younger ones; and this may possibly have given rise to the supposi- 
tion referred to; but M. Battandier is emphatic in his statement. 
The negative heliotropism in Linaria Cymbalaria is much less 
remarkable than in this Fumaria; for usually its capsules are 
merely turned toward the wall or rock on which it is growing, and 
when burst by a gust of wind, or its maturity alone, the seeds are 
scattered, falling by chance into any chink in the wall. Fumaria 
seems to perform an act of oviposition. 
Notes on some Cape Orchids. By Harry BoLus, F.L.S.* 
[Read May 4, 1882.] 
Disa, HERSCHELIA, &c. 
The usual structure of the column in the genus Disa is well 
exemplified in D. grandiflora, L., the largest of the species. In 
fig. 1 the rostellum +, standing up behind the Fig. 1. 
stigma s, is expanded at the summit into two 
recurved processes, which hold the widely 
parted disk-shaped glands g, terminating the 
caudicles of the pollinia contained in the 
anther a. The stigma s is three-lobed. 
In several other species of Disa which I have 
examined there are slight modifications of this 
form of structure. The rostellum may be 
shorter, or bent further backwards, or the 
arms are less divaricate; but, with the excep- 
tions now to be noted, the general structure 
remains the same. 
In D. barbata, Sw., belonging to Lindley's 
section Trichochilia, I found a marked depar- SE of Am Ai 
ture from the usualaPrangement of the parla E FE 
e us rangemen p 
as above described. 
* A List of published Species of Cape Orchidex which was appended to this 
Paper is unavoidably postponed in publication.—B. D. J. 
LINN. JOURN.—BOTANY, VOL, XIX. U 
