. Bulletin. Natural history; Natural history. Fig. 15. — Portion ot a stroma n(Xiimmit- liiriii in virtical section. The ovoid perithecia are enibtdded in the black stromatic tissue, and the black perithecial wall separates readil> from the stromatic tissue. X 70. germ tubes occurred in 24 hours and after they were 60 /x long. One colony, which had grown froin a single spore, produced in 10 days a growth 80 min. in diameter. The average growth for several colonies was 36 mm. in diameter, produced in 5 days. Cultures of A', clypeus from single- spore plantings on corn meal agar de- \eloped a
. Bulletin. Natural history; Natural history. Fig. 15. — Portion ot a stroma n(Xiimmit- liiriii in virtical section. The ovoid perithecia are enibtdded in the black stromatic tissue, and the black perithecial wall separates readil> from the stromatic tissue. X 70. germ tubes occurred in 24 hours and after they were 60 /x long. One colony, which had grown froin a single spore, produced in 10 days a growth 80 min. in diameter. The average growth for several colonies was 36 mm. in diameter, produced in 5 days. Cultures of A', clypeus from single- spore plantings on corn meal agar de- \eloped a sparse growth of interwoven, gra\ aerial h)phae. The surface growth was interwoven, gra\-tan and more dense than the aerial growth. Spores placed in sterile distilled water gave an average ger- mination of 28 per cent in 17 hours. N. tlypcus failed to sporulate when grown on artificial media. A culture of this Niim- itiiilarld is shown in fig. 17. A fmigus isolated from 28 specimens of diseased oak appeared to be identical with. «# *> .K • iL. ^ - » Fig. 16.—Ascospores of iV;(?HOT«/rtn'rt. The immature ascospores are hyaline to light brown, and the mature ascospores are dark brown to black. Fight ascospores develop in each hyaline \ 200. Fig. 17.—Culture ot Niimmulariti grown from a single-spore isolate. The aerial hyphae are gray, and the surface hyphae are gray to tan. The fungus grows vigorously and spreads rapid- 1\ on corn meal agar. known cultures of Nuinniularia clypeus. This fungus was isolated from discolored wood, stromatic tissue of cankers, canker- ous bark and discolored regions of living wood of both red and shingle oak. Diatrype Canker and Dieback I)iatr\pe cankers were found on me- dium to sinall branches of red oak in the northeastern region of Illinois. .A young canker is shown in fig. 18 and an old canker in fig. 19. Diatrype canker de- velops as a light to dark reddish-brown,. Please note that these images are extracted from scanned pa
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
