240 PUCCINIA 
Spermogones. Epiphyllous, in roundish clusters. 
Aeidiospores. Kcidia epiphyllous, on roundish yellow spots, 
in orbicular clusters as much as 1 cm. diam. surrounding a 
group of eae ine scutelliform, yellow, with a slightly and 
irregularly torn narrow margin; spores delicately verruculose, 
orange, 12—20 pw. 
Uredospores. Sori scattered or in rows, often confluent, 
oblong, elliptical or linear, long covered by the swollen epidermis 
which is at length longitudinally split, ferruginous; spores 
subglobose to ovoid, often flattened on one side, echinulate, 
pale-brown, 19—32 x 12—24 y, with two germ-pores. 
Fig. 185. P. Scirpi. Teleutospores and mesospore, from the original 
specimens, King’s Lynn (ex herb. Plowright). 
Teleutospores. Sori similar, generally numerous and con- 
fluent, black-brown; spores oblong or subclavate, thickened 
above (5—9) and rounded, truncate, or subconical, hardly 
constricted, attenuated downwards, smooth, brown, 30-—60 x 
12—24 1; pedicels yellowish, persistent, 25—45 uw long; meso- 
spores more or less abundant, 24—40 yw long. 
Ascidia on leaves of Limnanthemum (Villarsia) nymphueoides 
(Nymphoides peltatum), July; uredo- and teleutospores on culms 
of Scirpus lacustris, July—November. Rare; King’s Lynn; 
near Earith (Huntingdonshire). (Fig. 185.) 
Plowright suggested in 1889 (Monograph. p. 191) that this Puceinia 
was most likely a heterwcious species. Chodat was led, in 1891, to suspect 
the Limnanthemum as the alternate host, by finding the two stages both 
together in the same pond in the Botanic Gardens at Geneya. Klebahn 
