. Practical botany. Botany. Fig. lili). Black rust {I'ucrinia gramtnis) A, A small section of a wheat leaf upon which the parasitic rust is growing: m, mycelial liypha^ of the rust; ?/. )(, young summer spore, or uredospore; w, fully formed uredospore; si, upright liyplia upon which uredospore is formed. B, ger- mination of uredospore: kI, old liypha; ii, old uredospore wall; ni, new mycelial hyphfe. (', winter spore, or teleutospore: st, hypha; t, two-celled spore. D, ger- mination of teleutospore: st, old liypha; p, new hypha, or the promycelium; s, or sporidia. E, section of the ba
. Practical botany. Botany. Fig. lili). Black rust {I'ucrinia gramtnis) A, A small section of a wheat leaf upon which the parasitic rust is growing: m, mycelial liypha^ of the rust; ?/. )(, young summer spore, or uredospore; w, fully formed uredospore; si, upright liyplia upon which uredospore is formed. B, ger- mination of uredospore: kI, old liypha; ii, old uredospore wall; ni, new mycelial hyphfe. (', winter spore, or teleutospore: st, hypha; t, two-celled spore. D, ger- mination of teleutospore: st, old liypha; p, new hypha, or the promycelium; s, or sporidia. E, section of the barherry leaf showing aridiospore stage of rust: Ci upper , aud e^ lower epidermis; p, wall of cup or Eecidium; 0', ajeidiospores. Rearranged fi'om Duggar's "Fungous Diseases of ; All much enlarged 244. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York [etc. ] Ginn and company
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