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Updated: June 22, 2025


Dried clay on margin of the river showed dry G. verdans. Observation 28. Saline dust on earth that had been thrown out during the setting of a new post in the railroad bridge showed some Gemiasma alba. Observation 29.

The artist was a physician residing in one of the suburban cities of New York. I had demonstrated to him Gemiasma verdans, showed how to collect them from the soil in my boxes. And he had made outline drawings also, for the purposes of more perfectly completing his drawings. I gave him some of the Gemiasmas between a slide and cover, and also some of the earth containing the soil.

Observation 5. Seated on long marsh grass I scraped carefully from the stalks near the roots of the grass where the plants were protected from the action of the sunlight and wind. Found a great abundance of mature Gemiasma verdans very beautiful in appearance. The time of my visit was most unfavorable. The best time is when the morning has just dawned and the dew is on the grass.

Good specimens of Gemiasma rubra. Innumerable spores present in all specimens. Observation 13. Very good specimens of Protuberans lamella. Observation 14. The same. Observation 15. Dead Gemiasma verdans and rubra. Observation 16. Collection very unpromising by macroscopy, but by microscopy showed many spores, mature specimens of Gemiasma rubra and verdans. One empty specimen with double walls.

Found the area abundantly supplied with palmellae, Gemiasma rubra, verdans, and Protuberans lamella, even where there was no incrustation or green mould. Made very many examinations, always finding the plants and spores, giving up only when both of us were overcome with the heat. Observation 34. August, 1881. Visited the Wallabout; found it filled up with earth. August 17.

The illustrations show the manner in which the mature plants discharge their contents. Plate VIII. A, B, and C represent very large plants of the Gemiasma verdans. A represents a mature plant. B represents the same plant, discharging its spores and spermatia through a small opening in the cell walls.

White incrustation. Many minute algae, but two sporangia of a pale pink color; another variety of color of gemiasma. Innumerable mobile spores. Observation 10. Gemiasma verdans and G. rubra in small quantities. Innumerable mobile spores. Observation 11. Specimen taken from under the shade of short marsh grass. Gemiasma exceedingly rich and beautiful. Innumerable mobile spores. Observation 12.

One stellate compound plant hair, one Gemiasma verdans, two pollen. Grass flower dew. Some large white sporangia filled with spores. Grass blade dew, not anything of account. One pale Gemiasma, three blue Gemiasmas, Cosmarium, Closterium. Diatoms, pollen, found in greenish earth and wet with the dew. Remarks: Observations made at the pool with clinical microscope, one-quarter inch objective.

Reproduction by division, or by single cells being converted into new families; and by resting spores formed from some of the cells after impregnation by spermatozoids formed from the contents of other cells of the same family. Plate IX. Large group of malaria plants, Gemiasma verdans, collected at 165th Street, east of 10th Avenue, New York, in October, 1881, by Dr.

Gemiasma verdans found abundantly with many other things, which if rehearsed would cloud this story. Observation 24. Scrapings from the dirty end of the stick gave specimens of the beautiful double wall palmellae and some empty G. verdans. Observation 25.

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