. A textbook of botany for colleges and universities ... Botany. Fig. 177. — Pyronema: oogo- nium with its conjugating tube (or trichogyne); antheridium curved around the trichogyne (hence in section the latter appears as ,if piercing the former); trichogyne tip fused with antheridium and receiving nuclei; nuclei collecting in oogonium, —- After Fig. 178. — Pyronema: somewhat diagram- matic section of an ascocarp (involving two ascogonia), showing ascogenous hyphae aris- ing from the fertihzed oogonium (ascogonium) and producing asci. — After Harper. Ascobolus. — In this form structur
. A textbook of botany for colleges and universities ... Botany. Fig. 177. — Pyronema: oogo- nium with its conjugating tube (or trichogyne); antheridium curved around the trichogyne (hence in section the latter appears as ,if piercing the former); trichogyne tip fused with antheridium and receiving nuclei; nuclei collecting in oogonium, —- After Fig. 178. — Pyronema: somewhat diagram- matic section of an ascocarp (involving two ascogonia), showing ascogenous hyphae aris- ing from the fertihzed oogonium (ascogonium) and producing asci. — After Harper. Ascobolus. — In this form structures resembling sex organs have been found, and may be interpreted with the help of the life history of Pyronema. From the mycelium there arises a large, bow-form, septate hypha (the "swollen hypha "), to which other slender branches become attached. No fusion has been observed, but the position of the slender branches suggests that their function may be that of antheridia. In any event, the septate swollen hypha becomes a single chamber by the disappearance of the cross walls, and then gives rise to ascogenous hyphae that bear the asci. The paraphyses and the ascocarp also arise in the way described for Pyronema. It seems safe to infer that the. 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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