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TEXT-BOOK OF FUNGI 



Ex. Puccinia tragopogonis, on goat's-beard ( Tragopogon). 



Sect. E. Micropuccinia. Teleutospores only produced ; 

 germinating only after a long period of rest on the dead 

 matrix. 



Ex. Puccinia ribis, on currant and gooseberry. 



Sect. F. Leptopuccinia. Teleutospores only produced ; 

 germinating at once on the living host-plant. 



Ex. Puccinia malvacearum, on hollyhock and various 

 mallows. 



Many of the most destructive parasites known are 

 members of the present family. Distribution cosmo- 

 politan. 



Pilacreae 



This family is represented by one genus only, Pilacre, 

 which includes under twenty species scattered throughout 

 the world. The habit and general appearance is similar in 

 all ; the plants rarely reach half an inch in length, and 

 resemble a miniature drumstick with a stout stalk, or they 

 may be compared to Lycoperdon gemmatum in miniature. 

 Two species are met with in this country, but are 

 decidedly rare, having hardly been recorded outside 

 Epping Forest, where they are not uncommon, growing 

 in dense clusters on trunks of hornbeam. 



The genus was considered as belonging to the Hypho- 

 mycetaceae or moulds, and to approach in structure such 

 genera as Stilbum and Graphium, until Brefeld pointed 

 out that the spores were produced on specialised, short, 

 transversely septate hyphae ; about three septa are pre- 

 sent dividing the protobasidium into four cells, each of 

 which bears a sessile, coloured spore. On account of 



