'30 



SYSTEMATIC HISTORY OF THE INFTTSORIA. 



L. 1-325" ; B. 1-549". = E. circidare ^ 

 (Rfs.), JE. circular c, var. Falasiemis 

 (Breb.). G.B., R 



E. Jemieri (nobis). — Frond scarcely 

 twice as long as broad ; segments 3-lobed, 

 basal portion suhquadrate, emarginate at 

 the sides ; end lobe somewhat dilated, its 

 notch linear, (ah, c.) 



Empty frond punctate, segmetits with 

 several small injlations arranged in alter- 

 nate lines. =E. circidare y (Ralfs), E. cir- 

 cidare, var. Ralfsii (Breb.). G.B., F. 



Mr. Ealfs unites this and the two pre- 

 ceding as three varieties of E. circidare 

 (Hass.). They seem, however, to be 

 quite as distinct as any other species de- 

 scribed, not only in external outline, but 

 also in the distribution of the supei-ficial 

 inflations. 



2 1 End lobe straight or concave without 

 a central notch. 



1^. pectinatum (Breb.). — Frond rather 

 more than twice as long as broad ; seg- 

 ments 3-lobed, basal portion suhquadri- 

 lutei'al'j lateral lobes horizontal, deeply 

 emarginate, end lobe much dilated, 

 straight or slightly concave at ends, angles 

 entire or emarginate. (ab,c.) Emptyfrond 

 punctate ; f. v. segments with three in- 

 flations near the base ; tr. v. elliptic with 

 three inflations at each side and two at 

 each end ; e. v. end lobe with two minute 

 lobelets at each end, and two near them 

 at each side. Sporangium orbicular, beset 

 with conical tubercles, (ii. 10 & 30.) 

 L. 1-362 ' ; B. 1-558". G.B., I., F. 



E. gemmatum (Kg., Breb.). — Frond 

 scarcely twice as long as broad ; segments 

 3-lobed, lateral lobes horizontal, deeply 

 emarginate, the protuberances minutely 

 gratiidate; end lobe dilated, its dilata- 

 tions inclined upivards, and minutely 

 granulate ; ends tcith a deep rounded emar- 

 gination. {ah, c.) Empty frond slightly 

 punctate; f. v. segments with three 

 granulate inflations near the base ; tr. v. 

 broadly elliptic, with three granulate in- 

 flations at each side and one at each 

 end ; e. v. end lobe cruciform, lobe- 

 lets rounded, gTanulate. L. 1-443" ; 

 B. 1-641". = Euastrum {Eucosmium) 

 Hassallianum (Nag.). G.B.^ I., F., 

 Prussia. 



3* Frond loithout a distinct terminal lohe, 

 frequently having a process or ^ acute 

 angle at corners of terminal portion. 



E. rostratum (Ralfs). — Frond scarcely 

 twice as long as broad, oblong ; segments 

 with their laasal portion deeply emargi- 

 nate at the sides, connected by a broad 



neck with the teiininal portion; ends 

 protuberant, angular, acutely emarginate 

 at the centre, and having at eacli side 

 a horizontal subacute projection, (ah, c.) 

 Sporangium orbicular, spinous; spines 

 conical, attenuated. L. 1-650" to 1-580" ; 

 B. 1-1000" to 1-714". (I. 26.) G.B., 

 I., F., U.S.A. 



E. p)ulchellum (Breb.). — Frond rather 

 more than one-third longer than broad, 

 oblong ; segments with the basal portion 

 twice or thrice acutely dentate at each in- 

 flated basal angle, and connected by a 

 broad neck with the terminal portion ; 

 ends strcught, acutely emarginate at the 

 centre, angles acutely mucronate ; e.f. 

 bearing at the centre of each segment a 

 single inflated prominence bordered by an 

 annular series of granules (in s.v. trun- 

 cate), and a few scattered gTanules near 

 the projecting parts, {ah, c.) F. 



E. e/('//f//?s(Breb.,Kg.). — Frond minute, 

 scarcely t^vdce as long as broad, oblong ; 

 segments -wdth their basal portion emar- 

 ginate at the sides, connected by a broad 

 neck ^s-ith the terminal portion; ends 

 protuberant, rounded, acutely emarginate 

 at the centre, pouting ; s.v. with an infla- 

 tion at the base of the segments, sides 

 concave, ends rounded, {ah, c.) Sporan- 

 gium orbicular, spinous. = E. bidentatum 

 (Nag.). G.B.,I.,F.,G.,U.S.A. a, neck 

 somewhat constricted, end portion bear- 

 ing on each side an acute horizontal 

 spine-like projection. L. 1-888" to 

 1-445" ; B. 1-1441" to 1-714". /3, seg- 

 ments sinuated, neck not constricted and 

 without spines. L. 1-421"; B. 1-654". 

 y, neck not constricted, lateral projec- 

 tions bearing minute spines directed ob- 

 liquely outwards. = E. spinosum (Hass.). 

 L. 1-884"; B. 1-1388". 



E. crenatum (Kg.). — Frond very 

 minute, about twice as long as broad, 

 segments pyramidal, their lateral margin 

 crenate, ends broad, truncate, entire, 

 {ah, c.) F., G. 



E. hinah (Ralfs). — Frond veiy minute, 

 scarcely twice as long as broad, oblong ; 

 segments with their basal portion either 

 entire or bicrenate at the sides, slightly 

 contracted beneath the ends ; ends di- 

 lated, not jjrotuberant beyond the angles, 

 its central notch acute, broad ; tr.v. with 

 two lateral inflations, ends truncate, 

 angles rounded, {ahc.) L. 1-1570" to 

 1-1428"; B. 1-2400" to 1-1400". (in. 13.) 

 = Heterocarpella binalis (Turp.), C'os- 

 marium binale (Meneghini), E. Ralfsii 

 (Kg.), E. lohdatum (Breb.) ? E. duhium 

 (Nag.). G.B., I., F., U.S.A. ^, frond 

 rather larger, rough, with a few scattered 



