368 



The Scottish Naturalist. 



formities to which they give rise, add much to the interest that they 

 inspire. 



In the u British Uredinece and UstilaginecB " is an excellent 

 account of the life history and reproduction of representative 

 species from each genus, and of the methods that have been found 

 successful in experimenting on these organisms. 



Abbreviations and other marks, as well as the various kinds of type, are 

 employed with the same significations as in the Uredinece ; under which is 

 given an explanation of their meaning. 



Genus I. Ustilago Pers. 



1. U. longissima (Sow.) (M.S., 1328). 



On leaves of Glyceria fluitans ! Spring — Autumn. 

 Clyde, Tay ! Dee ! Moray ! Ross. 



2. U. hypodytes (Schl.) (M.S., 1329). 



On stems, below the leafsheaths, of *Elymus arenarius ! 

 *Ammophila arundinacea ! and * Agropyrum junceum ! 

 causing the affected stems to become tall, but preventing 

 the formation of the inflorescences. On the sea coasts. 

 June — October ! 



Tay (Menmuir, Rev. M. L. Anderson), Dee ! 



3. U. segetum (Bull.) (M.S., 1330). 



Causing " smut " in the ears of Avena sativa ! Hordeum 

 distichum ! and II. hexastichum ! July — October. 



Tweed, Solway, Forth ! Clyde ! Tay ! Argyle, Dee ! 

 Moray, Ross, Sutherland, Orkney ! 

 Var. nuda Jensen, is common on Barley ; var. tecta Jensen has 

 been found in Iona ; both fide Plowright. 



4. U. grammica B. & Br. (M.S., 1327. "On grasses 



Summer — Autumn.") 

 Tay. 



5. U. Caricis (Pers.) (U. urceolorum Tul. M.S. 133 1). 



In ovaries of Car ex Goodenovii ! C. panicea ! C. glauca ! 

 C* pidicaris ! and C* dioica ! causing " smutting." 

 Summer — Autumn ! 



Tweed, Forth, Tay ! Argyle ! Dee ! 



6. U. vinosa (Berk.) (M.S., 1332). 



In ovaries of Oxyria digyna ! up to 2500 ft., destroying the 

 ovaries. July — September ! 

 Tay, Dee ! (Glen Callater !). 



