Conference of the Woods Department; [proceedings] . G zft. =•. s s u 5 a = —-_ J i ^ ^ i i 5- c ^ •- I- , ^ OJ ^ tfj r t- H POLYPORUS BETULINUS. So far as is known polyporus betulinus occurs only on species ofbirch. It is widely distributed over Europe, Asia and North America. Inthis country it occurs in the yellow, white and paper birch. The sporophores form half rounded conspicuous brackets which startas small rounded knobs usually growing through a lenticel. These knobsrapidly expand till they form a hemi-spherical papery sporophore. Theupper surface is very smooth, usually dirty white in c
Conference of the Woods Department; [proceedings] . G zft. =•. s s u 5 a = —-_ J i ^ ^ i i 5- c ^ •- I- , ^ OJ ^ tfj r t- H POLYPORUS BETULINUS. So far as is known polyporus betulinus occurs only on species ofbirch. It is widely distributed over Europe, Asia and North America. Inthis country it occurs in the yellow, white and paper birch. The sporophores form half rounded conspicuous brackets which startas small rounded knobs usually growing through a lenticel. These knobsrapidly expand till they form a hemi-spherical papery sporophore. Theupper surface is very smooth, usually dirty white in color with no signs ofmarks or cracks. The outer margin is round and extends down over thelower surface, forming a decided ridge around it. The lower surface isbrown and the pores are irregularly jagged. The sporophores are annualand grow in some instances to be quite large. The decav is very similar tothat described for Fomes fomentarius. The decayed wood is very uniformlyyellow in color and shows numerous cracks extending both radially andtangentially t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlumbert, bookyear1915
