ENTWICKLUNG DER FLORIDEENGATTUNG MARTENSIA 147 
description and Same given by Jorgensen. As some of the cap- 
sules in Mr. Hunter’s gathering were deoperculate, while others 
retained the lid ae even the calyptra, it may be concluded that 
Jo eorirar s suggestion is correct, that July is the time of maturing 
the fruit.—H. N. Drxon. 
Haprtomirrium Hooker! In Devon.—Haplomitrium Hookeri 
is so rarely found in this country that its particular habitats are 
worthy of note. So far as I am aware, Haplomitrium had not 
it growing near boggy ground on the dip slope of Woodbury 
Com about a mile behind Woodbury Castle, a little distance 
due Hott of Budleigh Salterton on the coast. I found seven or 
eight plants of both sexes. The plants are on an old cart-track 
just where it dipped a vibe owing to its being crossed by a tiny 
water-channel. In December, 1906, I was able to detect Haplo- 
mitrium in "the same steer I have repeatedly Mocs opt spot 
during 1907 and 1908, but have not found Haplomitri 
The rarer plants s o have given place to commoner forms 
The spot is only a ale scjuae yards in area, sed a conditions 
dda there are never twice alike.— 
Ranuncutus Lruaveanvs Schlecht. aang species is described 
by Schlechtendal (Linnea, x. 233) from a plant collected by 
Schiede in grassy places, Ja Jalapa, Mexico, ees we have authentic 
specimens in the National Herbarium. It is a ee with deeply 
dissected leaves, resembling in this respect R. delphinifolius 
and R. dichotomus DC.; Mr. Hemsley (Bot. Biolog. Cen- 
REVIEWS. 
Ueber den tn und die ap eatnomgaed der Florideengattung Mar- 
tensia. Von Nims Svepenius (K. Syensk. Vet. Akad. 
Handl. ~~ No. 7). 1908. 101 pp. Four plates and sixty- 
two 
THE nthe Banding that the respective explanations afforded 
Harvey and Agardh as to the origin of the reticulate zone of 
the thallus of Martensia were insufficient and at variance, has in- 
vestigated the matter for himself. And, being the fortunate pos- 
sessor of material preserved in formalin, he has been able to 
