The Scottish Naturalist. 



171 



constant supply of silica has continually been carried down. This 

 silicious matter enters into the formation of small plants, which, 

 ultimately dropping to the bottom, in the course of untold ages 

 may have formed these extensive beds. 



The deposit in the Black Moss is reckoned to amount to about 

 800,000 cubic yards. The extent at the west end of Loch 

 Kinnord is about 50 acres, the depth of which cannot very well 

 be ascertained, owing to the bed reaching underneath the water 

 of the loch. The former of these deposits was on the property of 

 Lord Aberdeen, and the latter on that of the Marquis of Huntly. 

 In recent years the properties, as well as a portion of the lands in 

 the vicinity, have been sold to a Mr. Wilson of Hull, who is now 

 proceeding with the excavation of the diatomite for commercial 

 purposes. 



REVISION OF SCOTCH DISCOMYCETES. 

 By Prof. James W. H. Trail, A.M., M.D., F.L.S. 

 {Continued.) 



141- Helotium agaricinum, Berk. (M.S. 1694; Ph. 170). 

 On decayed wood. 

 Argyle (Appin). 



142. H. buccinum Fr., (M.S. 1704; Ph. 170). 



"On pine branches and stumps. November." 



Argyle (Appin) ; Moray (Greeshop). 

 Mr. Philips {I.e.) says, " Carmichael's original specimen (129 Kew 

 Hb.) is £ inch broad, £ inch high, and decidedly gelatino— cartila- 

 ginous. It is to me, a Gnejrinia, there being no asci present. 

 Carmichael considered it a Tremella." 



143- H. sclerotioides Berk. (M.S. 1695 ; ph - 17°)- 

 On decayed wood. 

 Argyle (Appin). 



