Specimen #6: Cylindrocapsa

Name: Cylindrocapsa
Family: Cylindrocapsaceae
Collection Date: November 3^rd, 2011
Location: Hiram College Botany Lab, Algae Tanks
Collector: Katie Rumora

Key Used:

Prescott, G. W. (1970). How to Know the Freshwater Algae . Boston : WCB McGraw Hill .

1b. Plants microscopic, or if macroscopic with cellular structures and branches not clearly visible to the unaided eye; without whorls of branches clearly visible … 4

4a. (1) Cells containing chloroplasts with green predominating; or with other pigments predominating: yellow-green , golden yellow, brownish, reddish or bluish-green … 5

5a. Plants grass or leaf-green or gray- to violet-green, or tawny-green … 25

25b. Organisms non-motile in the vegetative condition. Cells solitary or colonial, or filamentous forms … 81

81a. Plant a filament or a branched, tubular, threadlike thallus without cross walls … 291

291a. Plant a microscopic, unbranched filament; attached or free-floating, or if macroscopic the thallus in the form of an expanded sheet, a tube; or a branched, arbuscular, gelatinous and beaded growth … 292

292b. Cells on constricted in the midregion … 301

301a. Chloroplast parietal, of various shapes, netlike, ringlike, or platelike, with pads and thin areas; or if axial, plants in the form of a macroscopic thallus … 316

316b. Thallus not in the form of a cushion, nor as a tuft of filaments … 317

317b. Thallus not a large, flat, crinkled sheet; attached … 318

318b. Thallus not an intestiniform tube … 319

319b. Plant otherwise; a filament or a gelatinous strand … 320

320a. A filament of cells … 328

328b. Plants otherwise; either uniseriate throughout, or uniseriate in the basal portion and multiseriate above; microscopic … 329

329b. Filaments uniseriate throughout when mature … 332

332b. Plants otherwise … 333

333b. Chloroplast otherwise, pyrenoids few or lacking … 335

335b. Chloroplast massive and dense, difficult of determination, or a parietal sheet of thick and thin areas, or branched, beaded thread … 353

353a. Cells quadrate or oval to subglobose … Cylindrocapsa

 

Figure 1: Cylindrocapsa  

Description:
“Filaments uniseriate and unbranched, at times biseriate, relatively short, mostly with distinct polar differentiation. Juveniles attached by short cellulosic holdfast, later free-floating. Cells ovoid to oblong, often joined in pairs or evenly spaced inside relatively tough, stratified mucilaginous sheath, with concentric cellulose layers around each cell. Chloroplast axile and stellate (when young), or parietal and massive, with single pyrenoid. Chloroplast structure often obscured by accumulations of starch grains. Asexual reproduction by spherical or oval biflagellate zoospores and oval walled aplanospores. Sexual reproduction oogamous and monoecious” (Algae Base ).

Links:
http://www.algaebase.org/search/genus/detail/?genus_id=43404
http://www.nrcresearchpress.com/doi/abs/10.1139/b75-054

References:
Algae Base . (n.d.). Retrieved November 10, 2011, from Cylindrocapsa Reinsch, 1867: http://www.algaebase.org/search/genus/detail/?genus_id=43404&-session=abv4:6B10FCF91b2070879EIny2CA18F0

Prescott, G. W. (1970). How to Know the Freshwater Algae . Boston : WCB McGraw Hill .

Protist Images: Cylindroccapsa . (n.d.). Retrieved November 10 , 2011, from Ulvophyceae: Ulotrichales:

Cylindrocapsaceae: http://protist.i.hosei.ac.jp/pdb/images/Chlorophyta/Cylindrocapsa/index.html