ON GRAMINE 125 
fEcidia on leaves and petioles of Glauz maritima, May ; 
uredo- and teleutospores on Scirpus maritimus, June to August. 
Banks of the Humber, Hull. (Fig. 76.) 
The researches by which Plowright proved the connection of these two 
forms are given in Grevillea, xxi. 111, and in Journ. R. Hort. Soc. xii. 
p. cx.; other observers have found a similar Uromyces on Scirpus mart- 
timus and therefrom have produced ecidia on other host plants such as 
Pastinaca sativa (Rostrup), Berula angustifolia, Daucus Carota (Bubak), 
Ginanthe aquatica (Klebahn), Hippuris vulgaris and Sium latifolium 
@ietel), etc. In North America, a morphologically indistinguishable 
Uromyces on Scirpus fluviatilis, etc. has produced an xcidium on Cicuta 
maculata (Arthur), and similar ecidia on allied Umbelliferze are suspected 
to belong to the same life-cycle. It is evident that U. Seirpi, like Puceinia 
Isiacae, is in its ecidial stage a plurivorous species, though possibly some 
of these forms may be separated in the future as “biological” races. In 
any case, they are not so sharply distinguished as in other instances, but 
Klebahn isolates our British species as U. maritimae Plowr. See the full 
account in Sydow, Monogr. ii. pp. 304—7. 
DisTRIBUTION: Europe and North America. 
37. Uromyces Dactylidis Otth. 
Aicidium Ranunculi-acris Pers. Obs. Mye. ii. 22. 
i. Ranunculacearum DC. FI. fr. vi. 97 p.p. Cooke, Handb. p. 539; 
Micr. Fung. p. 196 p.p. 
Uromyces Dactylidis Otth, Mittheil. Nat. Gesell. Bern, 1861, p. 85. 
Plowr. Ured. p. 130. Sace. Syll. vii. 540 p.p. Sydow, Monogr. ii. 
309. Fischer, Ured. Schweiz, p. 71, f. 54. 
U. graminum Cooke, Handb. p. 520; Micr. Fung. p. 214, 
Spermogones. Epiphyllous, honey-coloured, but also a few 
scattered among the zcidia on the lower surface. 
Aicidiospores. Aicidia hypophyllous or on the petioles, 
seated on yellow spots, in roundish or, on the petioles, elongated 
clusters, cup-shaped, yellow, with slightly torn, recurved margin ; 
spores delicately verruculose, pale-yellowish, 17—25 p. 
Uredospores. Sori amphigenous, scattered or in rows, small, 
elliptic or oblong, long covered by the epidermis, pulverulent, 
yellow-brown; spores globose to ovate, delicately echinulate, 
yellow or yellow-brown, 21—32 x 18—25y; epispore 14—2 p 
thick, with 7—9 germ-pores ; paraphyses generally wanting. 
