16 ON TRYBLIONELLA VICTORIZ AND DENTICULA SUBTILIS. 
Jordan. I have not seen any specimens otherwise authenticated, but | 
upon comparing our plant with the descriptions in the ‘ Florexdu 
Centre,’ it seems to me to differ appreciably from contempta, as there dé- 
“scribed, in stipules, petals, and spur, and upon the whole to corre- 
spond better with Jordan's V. agrestis... I have not myself grown this 
plant from seed, but I have seen it under cultivation in the garden of - 
my neighbour Mr. T. J. Foggitt, and have been furnished by him with | 
garden-grown examples. As grown by him in rich garden soil, the 
leaves became much more luxuriant, and the terminal lobe of the sti- — 
pules became more leaf-like than in the wild plant, whilst the arvensis 
character of flower was retained, the sepals being now conspicuously | 
longer than the petals, and the spur still about equalling the a 
appendages. 
It is much to be wished that some of our British botanists ake e 
gardens would take a little trouble to grow cornfield Pansies from seed, 
and give us the benefit of their experiences. . It is principally witha 
wish to suggest the doing of this that I have written out these notes. - 
ee 
TT 
ON TRYBLIONELLA VICTORLE AND DENTICULA SUB- | 
TILIS, TWO SPECIES OF BRITISH DIATOMACE. 
By W. CannuTHERS, Eso., F.L.S. 
My attention was called to Dr. Grunnow’s paper on the family 
Nitzschiew by a notice of it in the ‘ Bonplandia ’ for 1862, page 270, 
where it is stated that he described a new species, Tr: yhlionella Victorie, 
which he had collected. on the leaves of Victoria regia in Kew Gar- 
dens. He was of opinion that it was not indigenous, but probably 
brought with the plant on which he found it from South America. 
By the help of Dr. Seemann, I obtained from Dr. Grunnow a copy 
of his plate containing the figure of this Trybdlionella, along with 
manuscript notes of the characters distinguishing it from. the 
species... I have since (January 2nd, 1863) collected specimens in the 
Victoria tank at Kew, which I found on the leaves of Pistia Stratiotes, 
the great Lily having entirely disappeared during the winter season; 
Dr. 
indeed the principal tank was empty of water and everything. 
Walker-Arnott had already informed me, on the authority of Sir W. ji 
eon 
