A synopsis of the Characeae'
A synopsis of the Characeae'
A synopsis of the Characeae'
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1964 WOOD: A SYNOPSIS OF THE CHARACEAE 4131b. Dactyls irregular, allantoid to mucroniform; withoutmucus (1) .................................. 2(42) Nitella heteroteles [Af](several taxa may be sought here: N. macounii [NA]—see 21b; N. hookeri [ Aust, Oc]—see 23c).30b. Fertile whorls <strong>of</strong> modified, reduced branchlets compacted intotight heads; with mucus; primary rays normal, notexceeding 1 / 2 <strong>of</strong> branchlet length.32a. Dactyls elongate; end cell elongate, <strong>of</strong>ten twice as long aspenultimate cell; branchlets very slender .......................................................... 3(43) Nitella myriotricha [Aust, As]32b. Dactyls not elongate; end cells variable but not exceedinglength <strong>of</strong> penultimate cell; branchlets <strong>of</strong> normaldiameter.33a. Fertile branchlets (2–)3(-4)-furcate; central secondarybranchlet rays present; monoecious ............................................................... 4(44) Nitella capillata [NA]33b. Fertile branchlets 1(-2)-furcate; branchlets withoutcentral secondary branchlet ray; monoecious ordioecious.34a. Heads spicate; monoecious ............................................................... 5(45) Nitella leptostachys [Aust, Oc]34b. Heads variable, generally spheroid, rarely somewhatspicate; dioecious.35a. Axial internodes shorter than branchlets;sterile branchlets 1-2 (-3 ) -furcate ; 00-spore membrane with 6-8 meshes acrossfossa 6(46) Nitella grovesii [AS]35b. Axial internodes 1-2 times as long as sterilebranchlets ; sterile branchlets (1–) 3(-4)-f urcate; 2-4 meshes across fossa..................... 7(47) Nitella tasmanica2 [Aust, Oc][See N. dualis [As, Af, Aust?], 31a,which has 6-more meshes across fossa.]35c. Axial internodes 1-2 times as long as sterilebranchlets; sterile branchlets 1-2-furcate;oospore membrane (1) ......................................... 8(48) Nitella polycephala [Aust][Two pluricellulate taxa might besought here, N. gracilis subsp. lechleriand subsp. zeyheri.]19c. Dactyls 1-3-, 2-, 2-3-, or 2-5-celled <strong>of</strong> which <strong>the</strong> end cell is differentfrom o<strong>the</strong>r cells and is not allantoid; end cell a small,tapering, pointed cell ...........................................................................Subgen. 3(5) TIEFFALLENIA (Arthrodactylae, in part, cf. 19b)36a. Medium to large plants; some or all dactyl end cells mucronate,narrower at <strong>the</strong> base than <strong>the</strong> rounded end <strong>of</strong> <strong>the</strong>penultimate cell; heads occasionally formed, but withoutmucus ............................. Sect. 1(13) TIEFFALLENIA (Mucronatae)[ A broad group easy to recognize but hard to define so asto clearly differentiate from Sect. Gioallenia, Sect. Tieffalleniaincludes forms resembling <strong>the</strong> European "N. niucro-2The taxon Nitella gelatinosa A. Br. (nom. illeg.) is here expanded to include N.tasmanica Miill. ex A. Br. Since <strong>the</strong> former name is illegitimate, <strong>the</strong> latter becomes <strong>the</strong>correct name. N. tasmanica is here construed to include subsp. tasmanica and subsp.gelatinifera R.D.W., nom. et stat. nov. (basonym: Chara gelatinosa Braun, Linnaea17: 115. 1843; non Roth, Cat. Bot. 3: 125. 1806).