Puccinia Gramineae, 121 



Uredospores elongated ellipsoid to ovate oblong, brownish yellow, 

 echinulate, generally with 3-4 equatorial germ-pores on one face, 

 20-36 x 14-18 p. 



III. Teleutosori sparingly on leaf blades, more commonly on sheaths 

 stalks and inflorescence, linear, elongated, pulvinate, often con- 

 fluent, up to 10 mm. or more, dark brown to dense black, soon 

 rupturing epidermis which is prominent. 



Teleutospores clavate to oblong clavate, chestnut brown, smooth, 

 somewhat constricted at septum, very rarely three-celled, 35-63 

 X 14-25 p, average 52 X 18 p ; upper cell rounded or pointed at 

 apex, rarely truncate, considerably thickened (up to 12 p.), some- 

 times as broad as long, 21-29 p long ; lower cell attenuated to- 

 wards base, equal to or longer than upper, 18-35 p. long; pedicel 

 persistent, elongated, tinted, and sometimes as deeply coloured as 

 spore, of equal thickness throughout, up to 73 X 8 //. 



X. Mesospores very common, intermixed in the same sorus with uredo 

 and teleutospores, similarly coloured, dark chestnut or paler, oblong 

 to elongated ellipsoid, generally slender, rounded, pointed or trun- 

 cated apex and thickened like teleutospore, smooth, 34-46 x 10- 

 15 p ; pedicel generally short or of moderate length. Occasionally 

 an obovate form occurs, deeply coloured, rounded and thickened at 

 apex and much broader than usual, up to 22 p, with elongated 

 pedicel. 



On Wheat (Triticum vulyare Yill.), Polish Wheat (T. polonicum L.), 

 Oats (A vena sativa L.), Barley (HordeumvulgareL.),'Rje (Secale cerealelj.), 

 and various species of the following genera of Grasses: Agropyron y 

 Alopecurus, Amphibromus, Avena, Beckmannia, Briza, romus, Dactylis, 

 Deyeuxia, Echinopogon, Elymus, Festuca, Gtyceria, Nordeum, Phalaris, Poa. 



Common in all the States. 



Occasionally I have seen a uredospore with a slight indentation on either 

 side, just where the circle of germ-pores occurs, but never any indications of 

 a septum. The range of variation in the size of the teleutospores is great. 

 It may vary from 35 X 25 p. in the oblong, dark-brown, perfectly mature 

 spore to 63 ju, long, and sometimes only 14 p broad in elongated clavate spores 

 in the same sorus. 



The spore itself may be colourless, while the brown colouration is in the 

 pedicel, and this has previously been observed by Dr. Ptowngbt in Austra- 

 lian specimens ; or the upper cell only may be pale in colour as shown in 

 Plate L, Fig. 8, which is from abnormal material met with on one occasion. 



There are no paraphyses, but there are numerous mesospores closely re- 

 sembling teleutospores, but only one-celled. 



Darluca filum Cast., sometimes common on the uredosori, particularly 

 on Wild Oab (Avena fatua) and Glyceria stricta. It has also been found on 

 Agropyron scabrum, and Dr. Cobb 5 evidently mistook its true nature, for 

 he says : " Among its red-rust spots there are certain black bodies which 

 may constitute a fourth spore of the rust." 



The following is a complete list of all the grasses and cereals on which I 

 have found Puccinia graminis Pers. This determination of the fungus has 

 been based on morphological characters alone, for I have not yet succeeded 

 in infecting the Barberry. Those marked with an * are also recorded by 



E 2 



