328 USTILAGINEAE. 



T. maxima liostr. Occurs on rust-patches on Weymouth 

 pine. It has larger spores than the preceding species. 



Schroeteria.^ 



Spores joined in pairs, rarely in threes, with their broad 

 faces together. They are developed from single joints of a 

 septate non-gelatinous mycelium, particularly from short curled 

 lateral hyphae. Spherical conidia are produced, like those of 

 PeniciUinm, by intercalary growth in chains from the end of a 

 •conidiophore which is generally unbranched. 



Schroeteria Delastrina (Tul.) occurs in seeds of Veronica 

 arvend^, V. hedcrifolia, V. triplitjUa, and V. praccox. The spores 

 terminate in water, and produce conidia incapable of further de- 

 velopment, even when transferred to a nutritive solution. In such, 

 however, spore-germination is more vigorous, and an abundant 

 mycelium results, but it seems to be unable to produce conidia. 



Sch. Decaisneana (Boud.). In seeds of Veroiiica hederifolia at Paris. 



UREDINEAE. 



The Uredineae or liust-fungi possess several forms of spores, 

 one of which, the teleutospore, is rarely, if ever, absent from 

 the life-cycle of any species. The teleutospores consist of one, 

 two, or more cells enclosed in a thick coat of dark colour, and 

 thereby well adapted to carry the fungus over winter. "When 

 germination occurs, each cell of a teleutospore gives off a germ- 

 tube through a pore or thinner place in its wall, and from 

 this a promycelium^ is formed, consisting as a rule of four 

 cells. Each teleutospore originates from a sporophore of its 

 own, and in the course of development two nuclei, originally 

 present in each cell of the young teleutospore, fuse together. 

 When germination takes place, and the promycelium is formed, 

 the single cell-nucleus, derived as above, divides into two, then 

 into four, so that a nucleus is produced for each of the cells 

 of the promycelium. From the promycelium four sterigmata 

 are given off, and each produces a single sporidium.- These 



' Brefeld regards the species as forms of higher fungi, not as Ustilagineae (Heft 

 XII., p. 204). 



- Brefeld considers that the promycelium and sporidium are respectively a 

 basidium and a basidiospore. 



