ON GRAM1NE.E 



277 



globose, aculeate, yellow-brown, 20 — 28x20 — 24 /j, ; epispore 

 3 — 6 fi thick, with three germ-pores. 



Teleutospores. Sori similar, often confluent and as much as 

 8 mm. long, conspicuous, pulvi- 

 nate, black ; spores ellipsoid, 

 rounded at both ends, slightly 

 thickened (up to 5 p) above, 

 hardly constricted, smooth, brown, 

 32—46x20—30^; pedicels hya- 

 line or yellowish, curved, per- 

 sistent, rather thin, very long (as 

 much as 120/i); a few mesospores 

 sometimes intermixed. 



[JEcidia on Alelampyrum 

 spp.J: uredo- and teleutospores 

 on Molinia coerulea, July — Oc- 

 tober, Perthshire (Dr B. White). 

 This secidium is not recorded for 

 Britain, and appears to be very 

 rare everywhere. (Fig. 210.) 



Plowright, relying upon the experi- 

 ments of Rostrup, connected the 

 secidium on Orchis latifolia with this 

 Puccinia, though he himself could not 

 succeed in the infection. Others have 

 similarly failed, and there seems to be 

 little doubt that Rostrup's conclusions 

 were inaccurate. Juel has since then 

 succeeded in showing that an Becidium 



on Alelampyrum pratense is part of the life-cycle of a, Puccinia on Molinia, 

 which he named P. nemoralis, but of which there is no proof that it is 

 different from P. Moliniae Tul. (Juel, I.e.). Liro confirms this result and 

 names his species P. JEcidii-Melampyri (I.e.). The recidiospores are 

 described by Sydow as "yellowish," but Juel describes them as colourless, 

 like those of the allied species P. Phragmitis and P. Trail ii. 



Since the eecidium on Alelampyrum has not been found in this country. 

 the British species may turn out, on investigation, to be different from 

 these. For there is a closely allied species or biological race, named by 

 Cruchet (Centralbl. f. Bakter. 2. xiii. 9(5) P. Brune/larum-Aloli/tiae, which 

 has teleutospores very like those of P. Moliniae Tul. but its secidium on 



Fig. 210. 

 spores, 



White). 



P. Moliniae, 

 Rannoch (Dr 



Teleuto- 

 Buchanan 



