. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 423. Fig. 303.—Polyporus Ito- realis, hymenium with sinuous pores. After At- kinson. p. boreaHs (Wahl.) ;- ^® Pileus sessile, subimbricate, dimidiate to flabellifonn, often narrowly attached, spongy to corky, very tough, moist and juicy when fresh, 5-8 x 8-12 x 2-4 cm.; surface uneven, soft and spongy, hirtose-tomentose, azonate, white to yellowish; margin thin, white, entire, somewhat discolored on drying: context fibrous-coriaceous above, fibrous- woody below, white, cm. thick;
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 423. Fig. 303.—Polyporus Ito- realis, hymenium with sinuous pores. After At- kinson. p. boreaHs (Wahl.) ;- ^® Pileus sessile, subimbricate, dimidiate to flabellifonn, often narrowly attached, spongy to corky, very tough, moist and juicy when fresh, 5-8 x 8-12 x 2-4 cm.; surface uneven, soft and spongy, hirtose-tomentose, azonate, white to yellowish; margin thin, white, entire, somewhat discolored on drying: context fibrous-coriaceous above, fibrous- woody below, white, cm. thick; tubes 4-8 mm. long, white to pallid within, mouths angular, irregular, somewhat radiately elongate, sinuous at times, 1-2 to a mm., stuffed when young, edges thin, white to ochraceous, dentate to lacerate; spores ovoid, smooth, hyaline, 5-6 x 3^ fi; hyphiE 6-7 fj,; cystidia none. On pine, spruce, hemlock, balsam pine, etc., as a wound parasite or as a sapro- phjrte on dead trees producing a white rot. The mycelium ad- vances longitudinally, radially and tangentially. At certain stages it is very abundant and forms cords in the channels formed by the fungous enzyme. Later these cords disappear. The young mycelium is stout and yellow, later it is more delicate. Dis- solution of the cells begins at the lumen and proceeds outward, the middle lamella persisting last. P. dryadeus ; Sporophore very large, sessile, dimidiate, rarely circular, usually imbricate, applanate or depressed above, convex below, fleshy to spongy-corky, rather fragile when dry, 15- 30 X 25-65 X 3-5 cm.; surface very un- even, azonate, opaque, hoary-isabelline, anoderm to very thinly encrusted, sub- shining and bay; margin thick, pallid, entire to imdulate, weep- ing; context thick, zonate, subglistening, ferruginous-isabelline to fulvous, cm. thick; tubes grayish-umbrinous to fulvous within, 5-15 mm. long, slender, very fragile, mouths whitish when young, becoming somewhat resinous in appearanc
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
