Copyright (c) 2009 Butler University All rights reserved. http://digitalcommons.butler.edu/botanical Recent documents in Butler University Botanical Studies en-us Fri, 20 Nov 2009 02:25:02 PST 3600 http://digitalcommons.butler.edu/botanical/vol12/iss1/14 http://digitalcommons.butler.edu/botanical/vol12/iss1/14 Wed, 18 Nov 2009 20:07:01 PST Additions and corrections Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/15 http://digitalcommons.butler.edu/botanical/vol12/iss1/15 Wed, 18 Nov 2009 20:07:01 PST Index of this volume. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/13 http://digitalcommons.butler.edu/botanical/vol12/iss1/13 Wed, 18 Nov 2009 20:07:00 PST The photomicrographs were made from herbarium material mounted in water or dilute solutions of detergents on mica slips or glass slides. At the magnification and with the equipment used, 1 millimeter equals 2.0 microns. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/11 http://digitalcommons.butler.edu/botanical/vol12/iss1/11 Wed, 18 Nov 2009 20:07:00 PST Plants of this family are elongate epiphytic unicells contained in thin gelatinous sheaths. The entire protoplast divides into a uniseriaer chain of rounded cells which often remain united by their membranes after the hydrolyzation of the sheath. The cells, upon separation from each other, elongate and secrete new gelatinous sheaths. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/12 http://digitalcommons.butler.edu/botanical/vol12/iss1/12 Wed, 18 Nov 2009 20:07:00 PST The following names have been described on the bases of material not included in the families treated above. Most of these names were originally described as members of the Chroococcaceae, Chamaesiphonaceae, or Clastidiaceae; or were transferred into those families at one time or another; or have been suspected as being members of those families. Where the original specimens have not been available for study, we have designated the original description as the temporary Type, to serve until specimens seen by the author can be found. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/9 http://digitalcommons.butler.edu/botanical/vol12/iss1/9 Wed, 18 Nov 2009 20:06:59 PST The third and final portion of this article. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/10 http://digitalcommons.butler.edu/botanical/vol12/iss1/10 Wed, 18 Nov 2009 20:06:59 PST In this family, the plants, originally unicellular, grow eventually into strata or cushions from which filaments of cells penetrate the substratum. The solitary cells are basically attached to the substratum by a sheath of gelatinous material; cell division proceeds, at right angles to the axis of the cell, in an unequal fashion: the apical daughter cell is as a rule much smaller than the basal daughter cell. The upper part of the sheath is burst open, and the small daughter cell passes out of the mother cell sheath or develops in silu within the open sheath. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/7 http://digitalcommons.butler.edu/botanical/vol12/iss1/7 Wed, 18 Nov 2009 20:06:58 PST Most of the species of Chroococcaceae are capable of developing in various ways: as microscopic or macroscopic globular aquatic plants with homogeneous or lamellose matrices; as aquatic, subaerial, or aetial strata or cushions; or as free single cells where the sheath material has completely hydrolyzed. The cells, their methods of division and regeneration, and the arrangement of the cells in the plant are the chief means of distinguishing genera and species. Division of a cell into two equal daughter-cells is characteristic of the family. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/8 http://digitalcommons.butler.edu/botanical/vol12/iss1/8 Wed, 18 Nov 2009 20:06:58 PST The second part to this article. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/5 http://digitalcommons.butler.edu/botanical/vol12/iss1/5 Wed, 18 Nov 2009 20:06:57 PST Permanent preservation of these algae is most adequately assured by drying. The dried specimens can be placed in paper packets, labeled, and stored in the herbarium. Since most of the species thrive best in subaerial or temporarily inundated habitats, they exist for much of the year in the dried condition in nature. Wet algae can be laid top-side up on paper and allowed to dry in the open air. Drying in a plant press excludes the air, so that autolyzation of the protoplasm takes place; drying with heat often destroys the cells by cooking. If possible, part of the substratum should be preserved as part of the specimen. If the plants are microscopic and mixed with other algae, a good specimen should contain a sufficient number of the plants so that at least several may be found in every field of every mount made for microscopic study. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/6 http://digitalcommons.butler.edu/botanical/vol12/iss1/6 Wed, 18 Nov 2009 20:06:57 PST Herbaria in which specimens cited are to be found are indicated in the lists below by means of the following abbreviations. We are greatly indebted to the persons and institutions and their staffs who have made their collections available for this study. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/4 http://digitalcommons.butler.edu/botanical/vol12/iss1/4 Wed, 18 Nov 2009 20:06:54 PST The plant -- this term is employed here to indicate a single free cell or a group of cells joined together, usually in a gelatinous matrix. A specimen or single collection may contain many plants of one or few cells mixed with other algae; it may be a single entire globule, cushion, or stratum, or a part of one of these. In the Chroococcaceae and some species of Entophysalis, plants of the same species may be found in the form of strata, cushions, or globules (both microscopic and macroscopic), or as free unattached cells. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/2 http://digitalcommons.butler.edu/botanical/vol12/iss1/2 Wed, 18 Nov 2009 20:06:53 PST This study originated as an inquiry, some twenty years ago, into what names should be employed for species of coccoid Myxophyceae found in general collections of algae from various parts of the world. Gradually we accumulated and examined many thousands of specimens. Equally gradually it became apparent to us that only a carefully executed revision of the group, with sufficient attention paid to the morphological variation and life history of each species and with strict adherence to the stern discipline of the science of historical taxonomy, would produce a classification and a nomenclature which would satisfy our desire. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/3 http://digitalcommons.butler.edu/botanical/vol12/iss1/3 Wed, 18 Nov 2009 20:06:53 PST If botanists prior to 1777 encountered species of coccoid Myxophyceae, they probably referred them to the Linnaean genera Byssus, Tremella, or Ulva. J. Lightfoot in his Flora Scotica (1777) named a conspicuous gelatinous alga from wet places on the Isle of Skye Ulva montana (Anacystis montana of this paper). K Sprengel in Flora Halensis, Mantissa (1807) described green globules floating in a lake near Halle as Coccochloris stagnina During the period of 1790-1850, numerous genera and species were published. Francis Drouet http://digitalcommons.butler.edu/botanical/vol12/iss1/1 http://digitalcommons.butler.edu/botanical/vol12/iss1/1 Wed, 18 Nov 2009 20:06:52 PST The cover and publication information for Volume 12 J. E. Potzger