CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 107 



\y more. These bear terminally a whorl of branched hy- 

 phae. The hyphal branches of either the first or second 

 series average 12/jl by 2p. The conidial cluster is loose, and 

 spreads out widely, averaging 100/u to 350/a by 35/* to 70/* 

 (pi. 11, f. 1). The conidia are pointed oval in shape, 

 varying from 3/* to 4/j. in length, by 1.5 fi to 2/* in diameter 

 They are borne in simple chains of 40 to 80. They have 

 a blue-green color, and contain a pigment soluble in hot 

 alcohol, which does not change its blue-screen color either 

 by the addition of an acid or alkali. 



Penicillium roseum Link. 



A species of Penicillium which resembles Penicillium, 

 roseum Link was first found mino-led with P. aureum. 

 This fungus secretes a crimsonred pigment which discolors 

 sapwood. The work of investigation is not completed, 

 and it is thought best not to give further details concern- 

 ing this fungus at present. A third species has not been 

 identified. 



2. Fusarium. 



The species of Fusarium, identified as Fusarium roseum 

 Link, was isolated from pink, red and violet blotches found 

 on new pine lumber taken from lumber piles near Ashland, 

 Wis., in 1905. This grew readily under artificial culture, and 

 upon inoculation was found to be the cause of the blotches 

 upon the lumber. The boards from which the original 

 cultures were taken were sawn from trees of Pinus Strobus 

 L., and P. resinosa Ait. Similar stains have been found 

 on pine boards from the southern United States made from 

 Pinus palustris Mill., and Pinus echinata Mill., also on 

 pieces of wood from Pinus Virginiana Mill. 



This fungus, like other species of Fusarium that have 

 been studied, varies in form, color, and habit of growth, 

 depending upon the substratum upon which it grows. The 



