OF THE DESMIDIE^. 



733 



rounded pearly fframdes placed in lines, 

 the disc j^afictate ; e. v. broadly elliptic, 

 the large pearlv gTanules confined to the 

 rounded extremities, regularly disposed in 

 a few evident lines, the intermediate 

 central space punciate. " L. 1-37'" ; B. 

 \-4S"'.^' = JSuastrum {Cosmariuni) JJn- 

 (jerianum (TSag.). G. 



C. ovale ( Ralfs). — Frond A'ery large, 

 elliptic, nearly twdce as long as broad, 

 constriction very deep, linear ; segments 

 somewhat broader than long, somewhat 

 triangular, rounded at ends, rough near 

 the margin, ivith a hand of large pearly 

 granules, producing a dentate appear- 

 ance, the disc punctate ; e. v. elliptic. 

 L. 1-139" ; B. 1-240". G.B., R, U.S.A. 



C. prcsmorsuni (Breb.). — Frond rather 

 longer than broad, constriction deep, 

 linear ; segments broadly reniform, sides 

 rounded, ends somewhat trimcate, rough 

 with pearly granides, an annular series 

 of tchich,more elevated than the rest, forms 

 a ridge at the end hounding a circular 

 depression ; e. v. elliptic. F, 



C. margaritifenmi (Menegh.). — Frond 

 about as long as broad, constriction deep, 

 linear; segments reniform or semiorhi- 

 cular, rough cdl over ivith round and 

 scattered pearly granules; e. v. elliptic. 

 Sporangium orbicidar, spinous ; spines 

 branched at apex. L. 1-566" to 1-306" ; 

 B. 1-694" to 1-416". (I. l.)=Ursinella 

 margaritifera (Turpin), Euastrum mar- 

 qaritiferum (Ehr., Nag.), C. punctulatum 

 (Breb.) ? G.B., I., F., G., Italy, U.S.A., 

 Mexico. 



C. Portianum (Archer). — Frond about 

 one-third longer than broad, constriction 

 deep, tcide, somewhat round below, isth- 

 mus forming a short neck ; segments ellip- 

 tic, rough all over with minnte scattered 

 pearly granules', e. v. elliptic. L. 1-600"; 

 B. 1-930". I. 



C. latum (Breb.). — Frond large, about 

 as broad as long, constriction deep, sub- 

 linear; segments reniform, rough with 

 roimded pearly granules arranged in 

 someichat curved transverse lities; e.v. ? F. 



C. notahile (Breb.). — Frond about one- 

 third longer than broad, constriction 

 somewhat deep, acute ; segments slightly 

 longer than broad, broadest at the base, 

 gradually narrowing -upwards, sides con- 

 vex, ends trimcate, rough all over with 

 broad pearly gi-anules, giving a crenate 

 appearance to the margin (endochrome 

 in bands) ; e. v. oval, turgid. Sporan- 

 gium orbicidar, beset with numerous 

 short stout spines, inflated at the base, 

 and deeply divided at the apex. F., G. 



C. amoenum (Breb.). — Frond twice as 



long as broad, sides parallel, ends rounded, 

 constriction deep, linear; segments rough 

 with croivded obtuse papilla-like pearly 

 granules ; s. v. much compressed, about 

 thrice as long as broad ; e. v. elliptic. 

 L. 1-568" ; B. 1-1141". G.B., F., U.S.A. 



C. Botrxjtis (Menegh.).— Frond rather 

 longer than broad, constriction deep, 

 linea:- ; segments twice as broad as long, 

 broadest at base, narroiving upwards, sides 

 rather rounded, ends truncate, rough all 

 over with scattered rounded pearly gra- 

 nules ; e. V. broadly elliptic. Sporangiimi 

 orbicular, spinous; spines elongate and 

 slightlv di\4ded at the apex. L. 1-469" 

 to 1-327"; B. 1-625" to 1-^19". = If ete- 

 rocarjjella Botrytis (Bory), C. deltoides 

 (Corda), Euastrum Botrytis (Ehr., Kg., 

 Niig.), E. angulosum (Ehr.). G.B., I., 

 G., F., Italy, U.S.A. 



C.2)rotrdctu7n (Nag. sp.).— Frond about 

 as broad as long, constriction deep, linear; 

 segments twice as broad as long, infiated 

 and broadest at the base, rapidly tcqyering 

 into a somewhat evident neck, sides very 

 concave, ends abruptly tnmcate, rough all 

 over with scattered pearly granules ; 

 e. V. broadly elliptic, slighfl'y infiated at 

 the middle, and gi-adually sloping to the 

 rounded ends. L. 1-55"' to 1-33'". = 

 Euastrum protr actum (Nag.). G. 



C. gemmifermn (Breb. in lit. c. ic). — 

 Frond_ in f. v. about as long as broad, 

 constriction deep, sublinear; segments 

 broadest at the base, gradually narrowing 

 upwards, sides convex, ends truncate, 

 rough all over with pearly gTanules, 

 somewhat aiTanged in radiating lines, 

 each segment furnished at the middle, 

 on both surfaces, ivith a rounded protu- 

 berance bordered with gramdes ; e. v. 

 broadly elliptic, with the central tnm- 

 cate protuberance on each side. F. 



C. Turpimi (T3reb.).— Frond about as 

 long as broad, constriction deep, linear ; 

 segments twice as broad as long, some- 

 what triangidar, much infiated and 

 broadly rounded at the base, rapidly at- 

 tenuated, sides concave, ends tiWcate, 

 rough all over with scattered pearly 

 granules, and with a central gi-anulated 

 protuberance ; e. v. yiarroic-elliptic, with 

 the central broad truncate protuberance 

 on each side. = Heterocarpella Bidelta 

 (Tuq3in), C. Bidelta (I^g.). F., G. 



C. biretum (Breb.). — Frond in f. v. 

 about as long as broad, constriction deep, 

 linear; segments quadrilateral or sub- 

 hexagonal, narrowest at the base and 

 dilated upwards, convex or somewhat 

 truncate at ends, rough all over with 

 small granules arranged somewhat in 



