284 MR. J. C. WILLIS’S CONTRIBUTIONS TO 
and sporophore, the primary fronds in some cases consisting of 
erect prothalli borne on stalks, while in the case of the parent the 
primary frond had been eaten off when the plant came under 
notice, owing to a prothallus forming at tbe tip of the second 
frond and others subsequently on its edges and surface. This 
exhibit was therefore necessary to complete the case by supplying 
the missing step, which it does, I think, very satisfactorily. 
EXPLANATION OF PLATE XVII. 
Scolopendrtum vulgare, var. Drwummonde. 
Fig. 1. Fimbriate projection from edge of frond (much enlarged). p. Pro- 
thallus developed by culture on moist soil. rh. Root-hairs. c. Thick 
fleshy cushion. 
Fig. 2. Portion of frond, natural size, showing fimbriate projections terminating 
in pp. incipient prothalli. 
Figs. 3, 4, 5,6. Prothalli (4) developed after severance of fimbriate projections 
from frond and insertion in soil. 
Contributions to the Natural History of the Flower.—Part II. 
Fertilization Methods of Various Flowers; Cleistogamy in 
Salvia Verbenaca. By J. C. Witzis, M.A., late Frank 
Smart Student in Botany of Gonville and Caius College, 
Cambridge. (Communicated by Franots Darwin, F.R.S., 
F.L.S.) 
[Read 15th February, 1894.] 
(Puates XVIII. & XIX.) 
THs paper comprises the results of observations upon various 
native and exotic plants. The plants whose methods of fertili- 
zation were studied belong to the genera Brodiea, Stanhopea, 
Pimelea, Cotyledon, Nemophila, Hydrolea, Ziziphora. A study 
of cleistogamy was made upon Salvia. The observations are 
mostly of similar character to those detailed in the first paper 
of this series. 
Since the publication of my former paper *, my attention has 
been called by Prof. Bessey to a paper by himt in which the 
movements of the stamens in Claytonia virginica are described : 
the description tallies with that of the author for C. sibirica, &c. 
Robertson ¢ has described the fertilization of Ellisia Nyc- 
telea, L., which seems on the whole to resemble that of the less 
* Journ. Linn. Soc., Bot. vol. xxx. pp. 51-63. 
t “Sensitive Stamens in Portulaca,” Amer. Naturalist, vii. 1873, p. 464. 
¢ “Flowers and Insects, X.,” Bot. Gazette, xviii. 1893, p. 49. 
