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INFORMATION TO USERS This was produced from a copy of a document sent to us for microfilming. While the most advanced technological means to photograph and reproduce this documertt have been used, the quality is heavily dependent upon the quality of the material submitted. The following explanation of techniques is provided to help you understand markings or notations which may appear on this reproduction. 1. The sign or “target" for pages apparently lacking from the document photographed is “ Missing Page(s)”. If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure you of complete continuity. 2. When an image on the film is obliterated with a round black mark it is an indication that the film inspector noticed either blurred copy because of movement during exposure, or duplicate copy. Unless we meant to delete copyrighted materials that should not have been filmed, you will find a good image of the page in the adjacent frame. If copyrighted materials were deleted you will find a target note listing the pages in the adjacent frame. 3. When a map, drawing or chart, etc., is part of the material being photo­ graphed the photographer has followed a definite method in "sectioning" the material. It is customary to begin filming at the upper left hand corner of a large sheet and to continue from left to right in equal sections with small overlaps. If necessary, sectioning is continued again—beginning below the first row and continuing on until complete. 4. For any illustrations that cannot be reproduced satisfactorily by xerography, photographic prints can be purchased at additional cost and tipped into your xerographic copy. Requests can be made to our Dissertations Customer Services Department. 5. Some pages in any document may have indistinct print. In all cases we have filmed the best available copy. University M icrofilms International III! M /[(HMD A N N AHHUH MI-1H11H; 8207199 Hoops, Harold John, 111 ULTRASTRUCTURAL STUDIES OF SELECTED COLONIAL VOLVOCALEAN ALGAE The Ohio State University Rh.D. 1981 University Microfilms International300 N. Zeeb Road. Ann Arbor. MI 48106 PLEASE NOTE: In all cases this material has been filmed in the best possible way from the available copy. Problems encountered with this document have been identified here with a check mark V . 1. Glossy photog raphs or pages ^ 2. Colored illustrations, paper or print ______ 3. Photographs with dark background 4. Illustrations are poor copy ______ 5. Pages with black marks, not original copy ______ 6. Print shows through as there is text on both sides of page ______ 7. Indistinct, broken or small print on several pages_ 8. Print exceeds margin requirements ______ 9. Tightly bound copy with print lost in spine______ 10. Computer printout pages with indistinct print ______ 11. Page(s) ___________ lacking when material received, and not available from school or author. 12. Page(s) ___________ seem to be missing in numbering only as text follows. 13. Two pages numbered___________ . Text follows. 14. Curling and wrinkled pages ______ 15. Other __________________________________________________________________ __ University Microfilms International ULTRASTRUCTURAL STUDIES OF SELECTED COLONIAL VOLVOCALEAN ALGAE DISSERTATION Presented In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in the Graduate School of The Ohio State University by Harold John Hoops I I I , B .S ., M.S. * a * * * The Ohio State University 1981 Reading Commitee: Approved By Dr. Gary L. Floyd Dr. Daniel J. Crawford Dr. Michael L. Evans Dr. Thomas N. Taylor f Advisor f Department of Botany To Debbie ii ACKNOWLEDGMENTS X would like to thank Gary L. Floyd, my major professor, for the support and encouragement he has given me during my tenure at Ohio State, but even more for what he has taught me, both academically and otherw ise. 1 would also like to express my appreciation for the helpful Input of Dr. Charles 0 "Kelly and the members of my committee, Drs. Daniel J. Crawford, Michael L. Evans, and Thomas N. Taylor. Thanks also to Carol Stuessy who gave of her time and talentB In preparing the drawings which are so valuable in communicating the findings of these studies to others. I gratefully acknowledge my mother, who among other things taught me persistence, my father, who taught me the value of logic and the scientific method, Dr. Robert Mayer who gave me encouragement, and my wife Debbie, ;»ho has made my accomplishments p o ssib le . VITA April 3, 1954 Born-New York, New York 1976 B.S., C arroll College, Wuakesha, Wisconsin 1976-1981 Teaching and Research Associate, The Ohio State U niversity, Columbus, Ohio 1978 M.S., The Ohio State University, Columbus, Ohio 1981 Fresdentlal Fellow, The Ohio State University PUBLICATIONS Hoops, H.J. and G.L. Floyd* 1979. U ltrastructure of the cen tric diatom, Cyclotella meneghinlana: Vegetative cell and auxospore development. Phycologia 18, 424-435. Floyd, G.L., H.J. Hoops and J.A. Swanson. 1980. Fine structure of the zoospore of Ulothrlx belkae with emphasis on the flagellar apparatus. Protoplasma 104, 17-31• Hoops, H .J., G.L. Floyd and J.A. Swanson. 1981. U ltrastructure of the biflagellate motile cells of Ulvaria oxysperma (Kutz)Blidlng and phylogenetic relationships among Ulvaphycean algae. Amer. J. Bot. (in press). Hoops, H.J. and G.L. Floyd. Ultrastructure of the flagellar apparatus of Pyrobotrys (Chlorophyceae) . (submitted to J. Phycol.) Hoops, H.J. and G.L. Floyd. U ltrastructure and the taxonomic position of the rare Volvocalean alga Chlorcorona bohemlca (Chlorophyceae). (submitted to J. Phycol.) Hoops, H.J. and G.L.Floyd. Mitosis, cytokinesis, and colony formation in Astrephomene (Chlorophyceae, Volvocales). (submitted to Brit, phycol. J.) iv ABSTRACTS Hoops, H.J. and G.L. Floyd. 1978. Preliminary ultra s tru c tu ra l observations on the development of the auxospore of the freshwater diatom Cyclotella meneghinlana. Ohio J. Sci. 78, 26. Hoops, H.J. and G.L. Floyd. 1978. Preliminary ultrastructural observations on the development of the auxospore of the freshwater centric diatom Cyclotella meneghinlana. J. Phycol 14(Suppl.), 41. Floyd, G.L. and H.J. Hoops. 1979. U ltrastructure of the zoospore and germling of Ulothrix belkae. J. Phycol. 15 (Suppl*), 23. Hoops, H.J. and G.L. Floyd. 1980. Motile cell ultrastru c tu re of Ulvarla oxysperma (Chlorophy ta , Ulvales) and Its pylogenetlc sig n ifican ce. Ohio J. Sci. 80, 28. Hoops, H .J., G.L. Floyd and D.F. Chappell. 1980. Tannic acid fixation reveals covering on the "wall less" green alga Asteromonas gracilis. J. Phycol. 16 (Suppl.), 20. Floyd, G.L. and H.J. Hoops. 1980. Schizomerls lelbleinil revisited: Ultrastructure of the flagellar apparatus. J. Phycol. 16 (Suppl.), 20. Hoops, H.J. and G.L. Floyd. 1981. The ultraB tructure of the fla g e lla r apparatus of two colonial Volvocalean algae, Uva and Chlorcorona. Ohio J. Sci. 81, 30. Hoops, H.J. 1981. An u ltra s tru c tu ra l study of fla g e lla r apparatus development in Astrephomene gubernaculifera. J. Phycol. 17 (Suppl.), 3. Hoops, H.J. and G.L. Floyd. 1981. UltraBtructure of the fla g e lla r apparatus of Pyrobotrys and Chlorcorona (Volvocales). J. Phycol 17 (Suppl.), 5. V TABLE OF CONTENTS DEDICATION.......................................................................................................................................ii ACKNOWLEDGMENTS........................................................................................................................ i l l VITA.....................................................................................................................................................iv LIST OF FIGURES........................................................................................................................v ii INTRODUCTION.....................................................................................................................................1 CHAPTER 1. ULTRASTRUCTURE OF THE FLAGELLAR APPARTUS OF PYROBOTRYS...............................................................................4 CHAPTER 2. ULTRASTRUCTURE AND TAXONOMIC POSITION OF THE RARE VOLVOCALEAN ALGA CHLORCORONA BOHEMICA...............................................................................25 CHAPTER 3. ULTRASTRUCTURE OF THE FLAGELLAR APPARATUS AND FLAGELLAR MOTION IN ASTREPHOMENE GUBERNACULIFERA..................................................35 CHAPTER 4. THE DEVELOPMENT OF THE FLAGELLAR APPARATUS IN ASTREPHOMENE.....................................................................59 CHAPTER 5. MITOSIS, CYTOKINESIS AND COLONY FORMATION IN ASTREPHOMENE GUBERNACULIFERA..................................................86 CHAPTER 6. OVERVIEW..............................................................................................................Ill LIST OF REFERENCES................................................................................................................120 LIST OF FIGURES Scanning electron micrograph (SEM) of Pyrobotrys caslnoensis ....................................................... 17 SEM of stellata ................................................................... 17 Papilla and flagellar insertion in P^. caslnoensls ...................................................................................... 17 Suggested reconstruction of the Pyrobotrys flagellar apparatus ................................................................
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