July 1903.] BOTANICAL SOCIETY OF EUINBUKGH 395 



Agaricus— continued — 

 *A. campestris. 

 *A. (Omphalia) umbelliferus. 

 Lycoperdon.* 



L. cselatum. 

 Inoderma. 



I. arenarius. 

 Gyathus. 



C. fimicola. 

 Isaria* 



I. fuciformis. 



I. umbriiia. 

 Bovista. 



B. lilacina. 

 Nematogonium. 



N. aurantiacum. 

 Pestalozziella. 



P. circulare. 

 Patellaria sp. 

 Stereum.* 



S.. lobatum. 



S. hirsutum. 



S. elegaus. 

 TheJephora.* 



T. pedicellata. 



Revised Note on Laminaria. By Thomas Berwick, 



St. Andrews. 



(Read 9th July 1903.) 



Demonstrations of the Masked Chlorophyll in fronds of above, 

 for Class purposes. 



(1) If a frond of Laminaria of any length — the longer 

 the better — after being simply air- dried, be passed with 

 moderate rapidity with both hands through an ordinary 

 bat-wing or bunsen flame, at once the brown colouring 

 matter (Phycophtein)^ disappears, the discharge of a misty 

 vapour accompanying the change, 



(2) By placing a coin heated to the proper temperature 

 on frond, and exerting pressure, a series of green impressions 

 can be immediately produced. Metal stamps of various 

 designs act similarly. To obtain printed impressions the 

 letters require to stand well out. 



(3) By playing a lens upon frond for a short time, green 



^ Botanical Microteclinique. By Dr. A. Zimmermanii. Translated 

 by J. E. Humphrey, S.D., 1896, p. 104. 



