8 



BULLETIN" 1053, U. S. DEPARTMENT OF AGRICULTURE. 



The lowest temperature tried by him was 10° C. (49° F.) ? and the 

 spores germinated at that temperature. 



Table 1. — Relation of temperature to the germination of basidiospores. 





Germination. 



Species and temperature. 



Per 

 cent. 



Taken in — 



Rate. 



Lenzites sepiaria (spores 3 days old): 

 12°C 



40 

 46 

 43 

 45 

 44 

 43 

 40 



" 33 

 34 

 32 

 36 



4 days 



do 



24 hours 



do 



do 



36 hours 



3 days 



Germinated in 2 days. 

 14 to 18 u in 20 hours. 



15° C 



20° C 



30 to 40 ti in 20 hours. 



28° C 



105 to 175 n in 20 hours. 



32° C 



210 to 350 ». in 20 hours. 



36° C 



180 to 250 n in 20 hours. 



40°C 



Swelling and beginning of tubes in 36 



Lenzites trabea (spores fresh): 



16° C 



hours. 

 12 to 21 n in 20 hours. 



20°C 



48 hours 



26 hours 



43 to 73 n in 20 hours. 



24°C 



90 to 143 n in 20 hours. 



28° C 



160 to 245 n in 20 hours. 



30° C 



210 to 350 n in 20 hours. 



32° C 



37 

 35 



(a) 



40 

 39 

 41 

 41 

 40 

 41 

 43 

 15 

 



1 

 15 

 15 

 17 

 23 

 24 

 33 

 26 

 12 



5 



40 

 50 

 54 

 60 

 75 

 75 

 50 

 6 to 25 

 



26 hours 



do 



36 hours 



12 days 



10 days 



6 days 



42 hours 



do 



do 



do 



3 days 



1 month 



9 days 



3 days 



do 



2 days 



24 hours 



do 



do 



do 



do 



5 days 



3 days 



2 days 



18 hours 



24 hours 



310 to 450 n in 20 hours. 



36°C 



175 to 200 p. in 20 hours. 



40° C 



Just beginning in 20 hours. 



Trametes serialis (spores 8 days old): 

 3°C 



7 to 32 n in 12 days. 



9°C 



15 to 25 u in 8 days. 



15° C 



160 to 300 n in 3 days. 



20° C 



31 to 68 n in 20 hours. 



25°C 



60 to 80 ii in 20 hours. 



28° C 



87 to 125 /x in 20 hours. 



32° C 



210 to 235 n in 20 hours. 



36° C 



Just beginning in 20 hours. 



40°C 





Fomes roseus (spores fresh): 



4°C 



Germination in 1 month. 



8°C 



Germination in 9 days. 



12° C 



Germination in 3 days. 





Just beginning in 20 hours. 

 12 to 36 n in 20 hours. 



20° C 



24° C 



57 to 98 m in 20 hours. 



28°C 



98 to 120 n in 20 hours. 



32° C 



84 to 121 v in 20 hours. 



36° C 



Just beginning in 20 hours. 



40° C 





Lentinus lepideus (spores 7 months 

 old): 

 5°C 



Thalli up to 43 n in 23 days. 

 25 to 40 ji in 5 days. 



10° c 



15°C 



50 to 80 u in 5 days. 



20° C 



43 to 61 £ in 20 hours. 



24°C 



133 to 174 m in 20 hours. 



28° C 



150 to 221 /i in 20 hours. 



32° C 



124 to 178 n in 20 hours. 



36° C 



42 to 60 m in 20 hours. 



40°C 



Just beginning in 20 hours. 









a Less than 1 per cent. 



The basidiospores of Lenzites trabea germinated in small per- 

 centages at 40° C. (104° F.), at high percentages from 24° to 32° C. 

 (75° to 89° F.), and most rapidly between 28° and 32° C (82° and 

 89° F.). 



The spores of Trametes serialis germinated at the lowest tem- 

 perature tried, 3° C. (36° F.), but not at 40° C. (104° F.). The gen- 

 eral optimum for percentage was between 20° and 32° C. (68° and 

 89° F.), with the most rapid germination between 30° and 32° C. 

 (86° and 89° F.). 



