FUNGOID PESTS OF CULTIVATED PLANTS. 241 



POA GRASS RUST. 

 Puccinia Poarum (Niels). 



This rust is developed on several species of Poa and has its accredited 

 cluster- cups on the leaves of the Coltsfoot (Tiissilago Far far a). 



The uredo pustules are small, round or elliptical, and orange, uredo- 

 spores spherical or elliptical, echinulate (20-30^u diam.), yellowish. 



Teleutospores in small black persistent pustules, usually somewhat 

 circinating, covered by the epidermis. Spores elliptical or club-shaped, 

 very variable, flattened at the apex, or conically thickened, dark brown 

 (35-45 x 18-25yu), on very short persistent brownish pedicels. 



The teleutospores germinate after a very short period of rest. 



Found in Britain, Switzerland, Italy, Austria, Germany, Finland, 

 Lapland, and Siberia. 



Plowr. Brit. Ured. p. 168 ; Sacc. Syll. vii. 2195. 



RED GRASS GELATINOUS MOULD. 

 Isaria fuciformis (Berk.), PL XXIII. fig. 24. 



This parasite was first named by Berkeley from specimens received 

 from Australia in 1873, but since then it has occurred freely in the 

 southern counties of England on pasture grasses, especially Festuca 

 ovina, from September to January. 



The fungus springs from a pinkish gelatinous mycelium, which has a 

 tendency to glue together the different parts of the grass on which it 

 locates itself. From this mycelium arise the tufts of pink or blood-red 

 filaments, sometimes thickened or flattened upwards and shortly branched, 

 and altogether fleshy and gelatinous when moist, rather horny when dry. 



The whole fungus consists of parallel cells or agglutinated septate 

 threads, bearing, about the tips of the threads and branches, innumerable 

 minute globose conidia. 



Found in Britain and Australia. Apparently the same as Isaria, 

 graminiperda (Berk. & Mull.). 



Sacc. Syll. iv. 2839 ; Smith, Field Crops, p. 57, figs. 17-20 ; Cooke, 

 Austr. F. 1993, fig. 325 ; Gard. Chron. 1873, p. 596. 



CREEPING GRASS MOULD. 

 Fusarium insidiosum (Berk.), PI. XXIII. fig. 25. 



It is some years since Berkeley called attention in the Gardeners' 

 Chronicle to a small mould which attacked some seedling grasses, and 

 especially Agrostis pulchella. At first delicate threads spread from plant 

 to plant, and all were soon involved in destruction. These threads were 

 found to be closely attached to the leaves -of the grass, were sparingly 

 branched and jointed, and giving off more or less closely compacted tufts 

 of necklace-like threads, terminated by curved, somewhat apiculate conidia, 

 which, according to their age, were from one to five septate. When 



B 



