434 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Linkola says unhesitatingly that he was dealing with the same Nostoc 
species throughout — N.punctiforme — and he considers that all the Nostoc 
Peltigera gonidia belong to the same species. The only instance of 
variation was found in Peltigera malacea , which may indicate some 
specific difference, or a physiological race. A. L. S. 
Vitricole Lichens and the Deterioration of Church Windows. 
Ethel Mellor {Rev. Gen. Bot ., 1922, 34, 280-6, etc., 336-45, 4 pis., 
4 figs.). The writer gives a list of the lichens she has determined from 
window glass. There is one new species, Caloplaca vitricola , with var. 
violacea , of which the spores are polari-locular, but the lichen gives no 
reaction with potash. The conclusions she comes to are as follows : — 
The immediate cause of corrosion is the mechanical action of the lichens 
on glass which has been altered chemically by moisture ; the silicates 
become more or less hydrolyzed, with formation of silicic acid and 
hydrates of calcium and sodium. The presence of lichens hastens the 
alteration that has already taken place. The glass coloured yellow 
sometimes resists corrosion a long time. To save the glass it suffices to 
clean the windows annually. The glass is sometimes pierced to a depth 
of 1*6 mm. and to a width of 5 mm., and occasionally it may be 
perforated. A. L. S. 
Lichens of Bolivia. — Th. Herzog ( Hedwigia , 1922, 63, 263-8). 
The author of the paper collected mosses and lichens on his second 
journey through Bolivia (1910-11). The mosses have already been 
named by himself ; the lichens were submitted to Zahlbruckner, and 
the results are now published. The forms collected were the more 
evident plants, and give a fair indication of the types of lichens preva- 
lent in the country. A. L. S. 
Lichens of North Bohemia. Contribution III. — Josef Anders 
(. Hedwigia , 1922, 63, 269-304, and 321-2). A very large number of 
lichens have been listed. The author comments on the absence of 
calcareous rocks ; basalts and siliceous rocks bore an abundant crop, 
and tree forms were many and varied. A few forms or species are new 
to the district, or new to science. A. L. S. 
Mycetozoa. 
Notes on Malayan Mycetozoa. — A. B. Sanderson {Trans. Brit. 
Mycol. Soc., 1922, 7, 239-56). The writer gives a review of work 
already done on Malayan Mycetozoa. He then describes the conditions 
of timber growth, of temperature, etc. He states that Mycetozoa 
require very careful search in the virgin forest ; their rarity is probably 
due to the abundant insect life. An account is given of the creatures 
that feed on the sporangia : ants are the most active and eager. A 
note is given as to the best methods of collecting and storing in the 
difficult tropical climate, and then follows a list of the species with very 
full biological descriptions. To the paper are added tables of the 
rainfall and of the occurrence and habitats of Malayan species. The 
habitats dealt with are : — Hevea logs, coconut, other palms, dead jungle 
