At 13,000 feet occurs either some simple Conferva or zygnema, it is doubtful which from the condition of the specimens; and at the same elevation, in the nearly dry bed of the stream which flows from the larger lake at Momay, amongst flat cakes, consisting of felspathic silt from the glaciers above, and the debris of Algae, and abounding in Diatomaceae, some threads of a zygnema.
"Himalayan Journals V2."
J. D. Hooker
An Anabaina occurs at a temperature of 125 degrees, but the same species was found also in the stream from the springs where the water had become cold, as was also the case with the zygnema.
"Himalayan Journals V2."
J. D. Hooker
These conjugate by means of short transverse tubes, after the manner of the threads of zygnema.
"Fungi: Their Nature and Uses"
Mordecai Cubitt Cooke