Spirogyra

Typically, periphyton is made up of a diatoms, a variety of filamentous algae (including Spirogyra, Anabanea, Oscillatoria, Lyngbya, Pithophora spp), and cyanobacteria.

Aquatic plants 2008

_Spirogyra_, and one of these will illustrate the characteristics of the order.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

The extraordinary similarity of the reproductive process, as shown in the examples I have given, Achlya, Spirogyra, and Vaucheria among algæ, the moss, the fern, and the flowering plant, a similarity which becomes the more marked the more the details of each case and of the cases of plants which form links between these great classes are studied, points to a community of origin of all plants in some few or one primeval ancestor.

Scientific American Supplement, No. 531, March 6, 1886 Various

The zygoblasts of conjugating algæ, as in Spirogyra.

Scientific American Supplement, No. 531, March 6, 1886 Various

Among the commonest forms, often growing with _Spirogyra_, are various species of _Closterium_ (Fig.  20, _A_, _B_), recognizable at once by their crescent shape.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

The formulæ vary from 1 part of copper to 100,000 parts of water, necessary to destroy the most resistant and very rare forms (three of these are listed), to 1 part of copper in 25,000,000 parts of water, which is a sufficiently strong solution to exterminate _Spirogyra_, the cress-bed pest.

The Home Medical Library, Volume V (of VI) Kenelm Winslow

One of this description, _Spirogyra_, has done thousands of dollars 'worth of damage by smothering the life out of young water-cress plants in artificial beds constructed for winter propagation.

The Home Medical Library, Volume V (of VI) Kenelm Winslow

_Spirogyra_, 30-32; Fig.  18. structure of cells, 30. starch, 31. cell-division, 31. sexual reproduction, 32.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

No microscopical examination was made of the growth, but I was informed that it seemed to be largely composed of filaments of _Spirogyra_ and other _Confervæ_.

The Home Medical Library, Volume V (of VI) Kenelm Winslow

Each thread is a long tube, branching sometimes, but not divided into cells as in _Spirogyra_ or _Cladophora_.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell