. A textbook of botany for colleges and universities ... Botany. THALLOPHYTES 69 out a tube that penetrates between the body segments or through the breathing pores of the insect. The myceUum finally kills it, filling the body in its vegeta- tive growth. At this stage reproduction begins, the mycelium sending out numer- ous short branches, from which eventually sporophores arise, reaching the surface of the body and each abstricling a single conidium, which is squirted off much as is the sporangium in Pilobolus, the dead body of a fly adhering to a window pane often being surrounded by a "
. A textbook of botany for colleges and universities ... Botany. THALLOPHYTES 69 out a tube that penetrates between the body segments or through the breathing pores of the insect. The myceUum finally kills it, filling the body in its vegeta- tive growth. At this stage reproduction begins, the mycelium sending out numer- ous short branches, from which eventually sporophores arise, reaching the surface of the body and each abstricling a single conidium, which is squirted off much as is the sporangium in Pilobolus, the dead body of a fly adhering to a window pane often being surrounded by a " halo of ;. Figs. 163-167. ^Afacor; 163, fertile branches (suspensors) in contact; 164, game- tangia (unequal) cut off; 165, 166, formation of zygospore by two very unequal sus- pensors ; 167, zygospore producing a mycelium, which has already produced a sporangium (after Brepeld). Conclusions. —The Phycomycetes strongly suggest relationship with the green algae, their coenocytic bodies resembling those of the Si- phonales. They also show a transition from an aquatic (Oomycetes) to an aerial (Zygomycetes) habit, accompanied by a transition from zoospores to aerial spores. There is also an apparent reduction of 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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