Bulletin. Natural history; Natural history

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Framed Print of Bulletin. Natural history; Natural history

Bulletin. Natural history; Natural history. 108 parasite preying upon the Helminthosporium mycelium; but numerous tests convinced me that such was not the case, but that what really occurs is that the old aerial mycelium dissolves (probably by auto-digestion). All stages of this disorganization can be followed under the immersion lens in stained preparations, where the disorganized filament stains with the gen- tian violet but is seen to be amorphous and without protoplasmic content. These phenomena appear to be limited to the aerial mycelium, but were. â h'- ?'J e. j â â â¢â -, &qu. Bulletin. Natural history; Natural history. 108 parasite preying upon the Helminthosporium mycelium; but numerous tests convinced me that such was not the case, but that what really occurs is that the old aerial mycelium dissolves (probably by auto-digestion). All stages of this disorganization can be followed under the immersion lens in stained preparations, where the disorganized filament stains with the gen- tian violet but is seen to be amorphous and without protoplasmic content. These phenomena appear to be limited to the aerial mycelium, but were. â h'- ~ ?'J e. j â _â â¢â -, ; >?ji. i: ^^ fc V-p Fig. 7.âVarious views (a and 6, low power, câo, high power) of mycelium of H. No. 1 in senescence: a and b showing dissolution to fine threads, and with a conidiophore still attached; câh and m, empty mycelial cells adjacent to cells nearly dissolved; / and j, protoplasmic cells adjacent to empty cells; k and t, fine mycelial outgrowths from protoplasmic cells; w and o. fine mycelial threads growing from the protoplasmic cells and through old empty cells; p, bits of mycelium, as seen with the immersion lens, showing the nuclei. obsered on many strains of Helminthosporium. Autodigestion of my- celium doubtless occurs in the case of wood-rotting fungi, as is exidenced by the absence of mycelium where it was previously known to be, and it may be of common occurrence in other fungi. It certainly occurs when two hyphae join by anastomosis, and in the union of sexual organs, drow- ing-through of the mycelium, as noted above, and even conidia-formation within the old cell are common in Saprolegnia, and have been noted in. 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 work.. Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, N. © Library Book Collection

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Media ID 40627266