CRONARTIUM 315 



produce the same on Vincetoxicum, Nemesia, Cynanchum, and Verbena, as 

 well as on many species of Paeonia. There is reason for believing that 

 the parasitism on Nemesia, at least, has arisen at a very recent date. This 

 species is therefore plurivorous in its teleuto-stage, but not in its secidial 

 stage. The mycelium is perennial, according to Fischer, in the pine- 

 branches; it produces eecidiospores in May and infects the alternate hosts, 

 on which uredo- and teleutospores are borne during the summer — the 

 latter can germinate at once. 



2. Cronartium Quercuum Miyabe. 



Uredo Quercus Brondeau in Duby, Bot. Gall. ii. 893 (1830). Cooke, 



Handb. p. 526 ; Micr. Fung. p. 216. Plowr. Ured. p. 257. 



Fischer, Ured. Schweiz, p. 539. 

 /'< i- ill milium defafiiKiHS and P. giganteum Tubeuf, Pflanzenkr. p. 429. 

 Melampsora (?) Quercus Schrot. ; see Sacc. Michel, ii. 308 ; Syll. vii. 



594. 

 Cronartium asclepiadeum var. Quercuum Berk. Grevill. iii. 59 (from 



the U.S.). Sacc. Syll. vii. 597. 

 C. Quercuum Miyabe, Bot. Mag. Tokyo, xiii. 74 (1899). 

 C. Quercus Arthur, North Americ. Fl. vii. 122 (1907). 



\_yEcidiospores. ^Ecidia caulicolous, forming' subglobose 

 swellings 5 — 25 cm. across, arranged in 

 tortuous lines or cerebroid, at first /r^\ ^^\ 



orange-yellow, bladdery; peridium col- 

 ourless, circumscissile, soon falling away 

 in flakes or sheets, about 2 cells thick, 



outer surface smooth, inner verrucose ; Fi "- ' 239 - c - Quercuum. 



. Uredospores, on Quercus 



cells roundish or irregularly compressed, ( ex herb. Thos. Brittain). 



walls very thick, lumen small ; spores 



obovate, 25 — 32 x 17 — 23 p. ; wall colourless, uniformly thick 



(2| — 31 /x), coarsely verrucose, usually with smooth spot at base 



and extending up one side, tubercles somewhat deciduous.] 



Uredospores. Sori hypophyllous, thickly scattered, round, 

 small (^ mm.), hemispherical, dehiscing by an apical pore, at 

 length surrounded by the torn epidermis, yellow ; peridium 

 delicate or wanting; spores obovate to broadly ellipsoid, orange- 

 yellow, 15 — 25x10 — 17 /x ; wall colourless, 3 /x thick, evenly 

 echinulate with short strong points. 



[Teleutospores. Sori hypoj^hyllous, columnar, filiform, 2 — 3 

 mm. long, 150 — 175 p, thick; spores fusiform to oblong, 30 — 40 



