ON UMBELLIFERE 187 
to have been shown experimentally that the ecidia and the teleutospores 
described above are genetically connected. The markings on the teleuto- 
spore are really little, round, densely crowded pits, not actual reticulations 
as in P. Chaerophylli. — Plowright’s statement (Jc. p. 270) that this 
zcidium was found by him on Conopodiuin denudatum is a mere slip of the 
memory, as am informed by Mr W. G. Smith, in whose company it was 
found at Leagrave, near Dunstable, on the date mentioned. 
DIsTRIBUTION: Western and Central Europe, Algeria. 
59. Puccinia tumida Grev. 
Puccinia tumida Grev. Flor. Edin. p. 430 (1824). Sydow, Monogr. 
i. 376. 
P. Bunii Winter ; Plowr. Ured. p. 206. 
P. Umbelliferarum DC. ; Cooke, Micr. Fung. p. 208 p.p., pl. 4, f.'71—2. 
Uredospores. Very few, oval, pale yellow, sparsely verrucu- 
lose, 20—25 x 15—18, mingled with the teleutospores. 
Teleutospores. Sori on the leaves, more often on the petioles 
and nerves, minute, but many crowded 
together and confluent in thickened 
elongated masses (up to 1 cm. long), 
covered by the ash-coloured epider- 
mis, for a considerable time, black- 
brown; spores ellipsoid to ovate, 
rounded at both ends, not thickened Fig. 135. P. tumida., Teleu- 
above, hardly constricted, smooth, pepe aaa creand use: 
brownish, 26—36 x 1426 w; pedicels 
hyaline, short, deciduous; an occasional mesospore is found. 
Cl) 
On Carum majus (= Conopodium denudatum = Bunium flexu- 
oswm). Not uncommon. April, May. (Fig. 135.) 
Formerly confounded with P. Bulbocastani, from which it is distin- 
guished by its very different habit. In that species the teleuto-sori 
are usually isolated on the leaves, and cause no swelling of the affected 
part as P. tumida always does: the latter moreover is without scidia. 
Plowright states that the mycelium is perennial, but this is doubtful. 
The sori appear to be confined to the radical leaves ; I have never seen them 
on the cauline leaves or (what practically means the same thing) attacked 
plants do not flower. The fungus should therefore be looked for early, 
before the radical leaves begin to fade ; the affected plants are then easily 
distinguished by their yellowish appearance. 
