OF THE DE«MIDIEiE. 



'31 



granules ; margins of segments crenate ; 

 acute angles of end portion sliglitly 

 horizontally prolonged, its notch small, 

 rounded (probably a distinct species). 



E. cuneatum (Jenner).— Frond large, 

 rather more than twice as long as broad ; 

 segments pp-amidal, broadest at base and 

 naiTOwing upwards, not lohcd, the sides 

 almost straight-, ends trmicate, central 

 notch linear, (a'^b^'^c.) Empty frond 



without inflated protuberances. L. 

 1-208" ; B. 1-420". G.B., I. 



E. pelta (Kg.). — Frond about t^\'ice as 

 long as broad, oblong ; segments quadrate, 

 each lateral margin with a small rounded 

 protuberance or injlation at the base, 

 another larger near the tipper end, and 

 another somewhat larger still at the ujjper 

 angle ; ends straight, not notched, (ab, c.) 

 = Cosmarium Pelta (Corda). G. 



Genus COSMARIUM (Corda). — Frond more or less constricted ; segments 

 undivided, usually rounded, sometimes slightly sinuated, or rarel}^ slightly 

 contracted, somewhat extended and truncate at the ends, never notched, 

 neither pro^-ided with spines nor processes; e.v. elliptic, and sometimes each 

 side wdth a lateral opposite inflation, or circular. 



* Frond compressed ; central constriction 

 a dee]), nsuallg linear, incision ; e.v. 

 compressed, either elhptic or subcruci- 

 form, oicing to the jjrojection at each 

 side of a protuberance or injlation. 



t Margins of segments entire, neither 

 crenate nor gi-anulate. 



Cosmarium sublobatum (Breb. sp). — 

 Frond scarcely twice as long as broad, 

 oblong; constriction linear, segments 

 subquadrate, somewhat wider at the base, 

 lateral and end margins slightly concave, 

 smooth, transverse view cruciform. L. 

 1-523" ; B. 1-646". = Euastrum ? sid)lo- 

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



C. pusiUum (Breb. sp.). — Frond very 

 minute, slightly broader than long, con- 

 striction acute, segments angulato-tra- 

 pezoid, slightly naiTO\\dng upwards, 

 smooth, angles rounded, ends slightly 

 concave. = Euastnnn pi(sillum(^i'eh.). F. 



C. quadratum (Ralfs). — Frond about 

 twice as long as broad, constriction deep, 

 linear ; segments quadrate, slightly pro- 

 tuberant on each side at the base, with 

 rounded angles at the ends, smooth ; e.v. 

 compressed. L. 1-510"; B. 1-952". 

 G.B., F. 



C. Qwumis (Corda). — Frond about 

 twice as long as broad ; constriction 

 deep, linear ; segments as broad as long, 

 with the basal angles rounded, broadly 

 rounded at ends, smooth ; e.v. elliptic. 

 L. 1-362" to 1-257"; B. 1-568" to 1-502". 

 — Euastrum integerrimumCEhv.). G.B., 

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



_C. Halfsii (Breb.). — Frond large, 

 slightly longer than broad, orbicular, 

 constriction deep, linear ; seginents semi- 

 orbicular, rounded at basal angles, 

 smooth ; e.v. elliptico-lanceolate ; endo- 

 chrome radiate. L. 1-227"; B. 1-270". 

 = C Cucumis (Hass.). G.B., I., F. 



C. rupestre (Niig. sp.). — Frond rather 

 more than twice as long as broad, con- 

 striction not deep but linear ; segmeyits 

 broadly oval, turgid, sides and ends 

 broadly rounded, smooth ; e.£ punctate, 

 puncta scattered. = Euastrum rupestre 

 (Nag.). G. 



C. pyramidatum (Breb.). — Frond 

 scarcely twice as long as broad, suboval ; 

 constriction deep, linear ; segments p}Ta- 

 midal, rounded at basal angles, somewhat 



\ truncate at the ends, punctate; e.v. 

 broadly elliptic. Sporangiimi orbicular, 

 tuberculated. L. 1-471" to 1-264" ; B'. 

 1-759" to 1-374". (ill. 14, e.v. \b.) = Pi' 

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

 C. lagenarium (Corda). — Frond about 

 t^-ice as long as broad, subelliptic ; seg- 



j ments triangular, pyramidal, punctate; 

 basal angles broadly rounded, sides some- 



1 ivhat concave, tapering, ends broadly 



I rounded. = C. ansatum (Kg.). G. 



I C. tinctum (Ralfs). — Frond very 



I minute, about as long as broad, constric- 

 tion producing an acute notch at each 

 side ; segments elliptic, about twice as 



[ broad as long, smooth ; e.v. narrow 

 elliptic. Empty frond someivhat reddish. 

 Sporangium quadrate, smooth, -with an 

 empty segment of the conjugated fronds 

 permanentlv attached to each comer. 

 L. 1-2325" ; B. 1-2500". G.B., I. 



C. bioculatum (Breb.). — Frond minute, 

 about as long as broad; constriction 

 deep, producing a gaping notch at each 

 side ; segments about twice as broad as 

 long, elliptic, smooth; s.v. compressed; 

 e.v. elliptic. Sporangium orbi<ndar, ivith 

 conical spines. L. 1-1416" ; B. 1-1773". 

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



C. depressum (Bailey). — Frond de- 

 pressed, broader than long, constriction 

 a deep, narrow, acute notch; segments 

 about twice as broad as long, angular at 



