. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 337 able yet not inter-inoculable. The aecial stage is found on leaves of conifers, the telia on a large variety of hosts. C. ipomoeae (Schw.) Burr. 0 and I. Unkno\vn. II. Uredinia hypophyllous, widely scattered or somewhat clustered, mm. across, early naked, orange-yellow fading to white, ruptured epidermis usually inconspicuous; spores ellipsoid, 13-21 X 18-27 M, more or less angular and irregular; wall thin, fi, closely and noticeably verrucose. III. Teha hypophyllous, widely scat
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 337 able yet not inter-inoculable. The aecial stage is found on leaves of conifers, the telia on a large variety of hosts. C. ipomoeae (Schw.) Burr. 0 and I. Unkno\vn. II. Uredinia hypophyllous, widely scattered or somewhat clustered, mm. across, early naked, orange-yellow fading to white, ruptured epidermis usually inconspicuous; spores ellipsoid, 13-21 X 18-27 M, more or less angular and irregular; wall thin, fi, closely and noticeably verrucose. III. Teha hypophyllous, widely scattered, often confluent, pul- vinate, mm. or less across, deep reddish-orange fading to pale- yellow; spores with wall swelling 20-40 fi above; contents orange- yellow fading to colorless, oblong, or slightly clavate, 19-23 x 60-80 yu, rounded or obtuse at both ends. Common on various Ipomoeas and their kin among them morn- ing glory and sweet potato.^'* C. soUdaginis (Schw.) Thiim.*'' ^'^""^ O. Pycnia amphigenous, scattered, numerous, originating be- tween mesophyll and cortical layer, noticeable, mm. â nade by mm. long, dehiscent by a longitudinal slit, low-conoidal, 80-100 M high. 1 ( = Peridermium acicolum). Mcia from a limited mycelium, amphigenous, numerous, scattered on discolored spots occupying part of a leaf, erumpent from longi- tudinal slits, tongue-shaped, mm. long by mm. high; peridium rupturing irregularly, moderately firm, white, cells overlapping, 35^5 n long, not much narrower, walls transversely striate, inner coarsely verrucose, thick, 5-6 /i, outer less rough and somewhat thinner; spores ellipsoid, 20-25 x 28^0 m; wall colorless, closely and coarsely verrucose with deciduous tu- bercles which are directed away from a smooth spot extending up one side, thick, 2-3 m on the smooth spot, increasing to 5-6 fi on the opposite side, including the tubercles. II. Uredinia hypophyllous, rarely also epiphyllous, irregularly.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
