'48 



SYSTEMATIC HISTOEY OF THE INFrSOEIA. 



C. gracUe (Breb.). — Frond very 

 slender, about twenty-five to thirty 

 times as long as broad, linear, nearly 

 straight, except at the exti-emities, which 

 are curved downwards ; sides parallel, 

 ends obtuse ; endochrojne arranged in a 

 zigzag or suhspiral manner ; e. f. without 

 strice. I., F. This species resembles C 

 jimciduni, a, in form, but diifers in the 

 arrangement of the endochrome and in 

 the absence of strise. 



2 1 Frond crescent-shaped, cui'vature 

 considerable. 



C. Bhrenhergii (Menegh.). — Frond 

 large, stout, about five or six times as long 

 as broad. Innately curved, extremities 

 tapering; upper margin ver}^ convex, 

 lower concave tcith a conspicuous central 

 injiation ; ends broadly rounded ; large 

 granules, numerous, scattered; fillets se- 

 veral ; e. f. colourless, mthout strise, 

 central sutm*e not evident. Sporangia 

 orbicular, smooth, placed between the 

 but slightly connected empty conjugated 

 fronds, the endochrome during the pro- 

 cess of conjugation emerging from the 

 opened apex of a short conical extension 

 from each under side of each younger 

 segment (or shorter cone) of each pair of 

 recently divided fronds, the conjugating 

 fronds being produced immediately pre- 

 viously by the self-division of a pair of 

 old fronds — two sporangia being thus the 

 ultimate produce of the two original 

 fronds. L. 1-68" ; B. 1-400". (xvi. 10, 

 11, 12, 13, 14.) = LunuUna monilifera 

 (Borv), C. Lunula (Ehr., Hass.). G.B., 

 I., R, a, U.S.A. 



C. moniliferum (Ehr.). — Frond smaller 

 than the last, stout, five or six times 

 as long as broad. Innately curved, extre- 

 mities tapering, upper margin convex, 

 lower concave with a central injiation, 

 ends rounded ; large granules, conspicuous, 

 in a single longitudinal series ; e. f. colour- 

 less, without strise, suture not evident. 

 L. 1-75" to 1-60" ; B. 1-510" to 1-466". 

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



C. obtusangulum (Corda). — Frond 

 stout, crescent-shaped, four or five times 

 as long as broad, rapidly attenuated, 

 " quadrangular " (six angles ?) ; upper 

 margin very convex, lower concave with- 

 out a central injiation ; ends narrowly 

 rounded ; e. f. colourless, without mark- 

 ings. 



C. Jinneri (Ralfs). — Frond small, di- 

 stance between the extremities six or 

 seven times the breadth, crescent-shaped, 

 much ciu'ved, gradually tapering (some- 



times with an obscui'e central constric- 

 tion) ', upper margin very convex, lower 

 very concave without a central inflation ; 

 ends obtuse, rounded ; large granules, in 

 a single series ; e. f. colourless, wdthout 

 strife. L. 1-281": B. 1-1730". G.B., I., 

 F., U.S.A. 



C. Leibleinii (Kg-)- — Frond somewhat 

 stout, distance between the extremities 

 six or eight times the breadth, crescent- 

 shaped, much curved, rapidly attenuated:, 

 upper margin very convex, lower very 

 concave, often with a slight central injia- 

 tion ; ends subacute ; large gi-anules, in a 

 single series ; fillets few or indistinct ; 

 e. f. somewhat straw-coloured, without 

 strife ; suture evident. Sporangium orbi- 

 cular. L. 1-291" to 1-165"; B. 1-1632" 

 to 1-582". (II. 1 & 5.) G.B., I., F., G., 

 Italy, U.S.A. /3 more slender, scarcely 

 inflated on the lower margin. 



C. Diance (Ehr.). — Frond slender, 

 crescent-shaped,six or eight times as long 

 as broad, much curved, rapidly attenu- 

 ated ; upper margin very convex, lower 

 very concave without a central injiation ; 

 ends subacute loith a very slight emargi- 

 tiation at the upper outer extremity ; large 

 granules, in a single series ; e. f. some- 

 what straw-coloured or faintly reddish, 

 without strise, suture evident. L. 1-143"; 

 B. 1-1275". = e. rujiceps (Ehr.), C. arcu- 

 atum (Breb.) ?, C. Venus (Kg.) ?, C. acu- 

 minatum (Kg.) ?. G.B., I., F., G., Italy, 

 U.S.A. 



C. incurvum (Breb.). — Frond minute, 

 somewhat stout, crescent-shaped, very 

 much curved, rapidly attenuated, ends 

 very acute ; e. f, without strise. F. 



4 * Fronds gradually tapering, curvature 

 often gradual, lower margin concave, 

 inclined doivmvards at the rotundato- 

 truncate or sometimes subacute ends; 

 e. f. striated. 



C. incequale (Ehr.). — Frond minute, 

 semilunate, attenuated; upper margin 

 very convex, lower concave ; extremities 

 unequal, conic, very acute ; large granules, 

 scattered ; e. f. prominently striated. G. 



C costatum (Corda). — Frond stout, 

 about five or six times as long as broad, 

 Innately ciu'ved, attenuated ; upper mar- 

 gin convex, equally arched, lower con- 

 cave; Olds obtuse, rounded; large gi'anules, 

 in a single series ; e. f. reddish, strice feio 

 (about six), conspicuous ; suture evident. 

 Sporangium orbicular, smooth, placed 

 between the deciduous emptv fronds. 

 L. 1-75"; B. 1-384". = C. turgidulum 

 (Kg.). G.B., I., F., G. 



