OF THE DESMIDIE^. 



729 



lated, its notch linear ; the upper margin 

 of the lobes horkontal. (a, 6, c.) 



Empty frond: f. v. segments punc- 

 tate, usually with two large inflations 

 near the base, fom^ smaller between, 

 three others above, and two on end lobe ; 

 s. Y. central constriction deep, segments 

 inflated at the base, then contracted, 

 again inflated, and again contracted be- 

 neath the dilated temiinal lobe ; tr. t. 

 with four lobes or inflations on each side, 

 and one at each end ; e. v. end lobe with 

 a deep sinus at opposite external mar- 

 gins, concave at the sides, so as to produce 

 four divergent lobelets. L. 1-188" ; B. 

 1-454". G.B. 



E. humerosum (Ralfs). — Frond about 

 twice as long as broad ; seg-ments sub- 

 6-lobed ; basal lobes slightly emarginate ; 

 middle lobes narroic, directed iqnvards, 

 resembling processes ; end lobe with a 

 short neck, partly included between the 

 middle lobes, dilated, its notch linear. 

 {a, h, c.) 



Empty frond minutely punctate ; f. v. 

 segments with three inflations at base, 

 two above and two on end lobe ; tr. v. 

 elliptic, with three inflations on each 

 side and one at each end. L. 1-225" ; 

 B. 1-382". G.B., I., F. 



E. affine (Ralfs). — Frond about twice 

 as long as broad ; segments 3-lobed ; basal 

 lobes slightly emarginate, having inter- 

 mediate between them and the end lobe 

 on each side a tubercle representing mid- 

 dle lobes, the tipper margin of tvhich is 

 horizontal', end lobe exserted, dilated, 

 its notch linear. (a&, c.) 



Empty frond : f v. minutely punctate ; 

 the segments wdth four basal inflations, 

 two above and two on end lobe ; tr. v. 

 elliptic, with fom* inflations on each side 

 and one at each end ; e. v. end lobe emar- 

 ginate at opposite external margins, pro- 

 ducing four shallow lobelets. L. 1-230" ; 

 B. 1-458". G.B., I., F., U.S.A. 



E. ampullaceum (Ralfs). — Frond rather 

 more than one-half longer than broad ; 

 segments obscurely 3-lobed, short, with 

 broad injiated base \ basal lobes not emar- 

 ginate, having on each upper side a small 

 intermediate tubercle between each and 

 the end lobe ; end-lobe exserted and di- 

 lated, its notch linear, {ab, c.) Empty 

 frond minutely pimctate ; f. v. inflations 

 indistinct or confluent ; s. v. narrow el- 

 liptic, ^N-ith several inflated protuber- 

 ances, ends scarcely dilated, rounded ; 

 tr. V. with four inflations at sides and 

 one at each end. L. 1-274" ; B. 1-394". 

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



E. insigne (Hass.). — Frond rather more 



than twice as long as broad : segments 

 inflated at base, sides entire, icithout late- 

 ral tubercles, and tapering into a long 

 slender neck ; end lobe dilated, its notch 

 linear, {ab, c.) 



Empty frond minutely punctate ; £ v. 

 segments with ttvo injlcitions at the base ; 

 s. V. naiTower, gi'adually tapering to the 

 end, which is considerably dilated ; pro- 

 jections roimded, with a sinus between j 

 tr. V. subquadrate, slightly concave at 

 sides, with a rounded lobe at the centre 

 of each end ; e. v. end lobe with a sinus 

 at opposite external margins, angles thus 

 protruded into foiu' divergent roimded 

 lobelets. L. 1-232" ; B. 1-416". (in. 12.) 

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



E. Didelta (Ralfs). — Frond rather more 

 than twice as long as broad ; segments 

 pyramidal, injiated at the base and again at 

 the middle, end scarcely dilated, roimded, 

 its notch linear, {a'^b, c.) 



Empty frond pimctate ; f. v. segments 

 with severed inflations in lines and two 

 at the end ; tr. v. elliptic with four injia- 

 tions at each side and one at each end: 

 e.^ V. end lobe entire at margin. Sporan- 

 gium orbicular, with subulate spines. 

 (I. 23, 24, tr. V. 25.) L. 1-185"; B. 1-357". 

 = CosiyiaritmiDideltai^lenegh.), E, bi?iale 

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



E. ansatum(H]iv.). — Frond about twice 

 as long as broad; segments inflated at 

 the base, tajjering upwards without sinua- 

 tions into a neck, end not dilated, roimded, 

 its notch linear, {ab, c.) 



Empty frond punctate ; f. v. segments 

 turgid on the sui'face, at the middle with- 

 out circular inflations; tr. v. elliptic, with 

 a single large inflation at each side ; e. v. 

 end lobe entire at the margin, its divisions 

 circular. L. 1-315"; B. 1-654". =^. bimde 

 (Kg.), Cosmarium ansatum (Kg.). G.B., 

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



E. circulare (Hass.). — Frond about 

 trvdce as long as broad, tapering upwards 

 into a neck, end not dilated, its notch an 

 acute incision, {ab, c.) 



Empty frond : segments withflve basal 



iiflations, four in a half circle round the 



flfth, and two others at the extremity. 



= Cosmarium circulare (Kg.), E. circulare, 



var. mtssallii (Bveh.). G.B., F., U.S.A. 



E. sinuosum (Lenormand). — Frond 

 about t^sdce as long as broad, segments 

 3-lobed, basal portion emarginate at the 

 sides; end lobe somewhat dilated, its 

 notch linear, {ab, c.) 



Empty frond punctate ; segments with 

 flve based inflations and two others at ex- 

 tremity ; tr. V. elliptic, with three infla- 

 tions at each side and one at each end. 



