■il
60 7YG0PHYCE.E.
Rabh. Alg. Eur. (1868), p. 192. Brebisson U s te (1856),
p. 120. w i t t r o c k Scan. Desm. (1869), p. 9.
TT q nss-tv it 109 t 31 f 1-3, Ralfs. Desm. (1848), p.
S i. bM ' I»f. ( I 8 6 0 , p. « 7 I. 1, f. 81.
Delponte Desm. ( 1 8 7 6 ) , p. 8 5 , t. iv , f. 2 - 4 - Ckve Sver. Desm
( 1 8 6 4 ) p. 4 8 6 . L u n d e l l Desm. Sueo. ( 1 8 / 1 ) , p . 1 3 . Wood
F. Water Alg/e U.S. ( 1 8 7 2 ) , p. 1 4 5 .
E u a s in w i sol., Ehr. Mikr. Leb. S. and N. Amer. (1843), t.
4, f. 16.
H ab. In clear pools. , or x
North Wales, Ireland ; France, Sweden, Italy, United States.
Flate x x r il.,flg . 1. a, living frond ; h, empty frond.
M ic za ste z ia s p a p illife za . in R alfs. Lesm. (1848), p. 72, t.
Frond orbicular, having the principal sinuses bordered by a
row of minute granules, otherwise smooth ; segments five-
lobed ; basal and middle lobes twice dichotomons, their ultimate
shallow subdivisions terminated by two, sometimes three, gdand-
like teeth ; end lobe emarginate, its angles dentate. Zygospore
orbicular, spinulose ; spines stout, scattered ®
at first simple and obtuse, then once or twice furcate, tips
recurved. ,
S iz e . Leng.h 110-135 g ; diam. 100-125 p (K.). ; length
110-120 « ; diam. 106-120 p (R.).
Wolle Desm. U S. (1884), p. 109, t. 32, f. 8-9 Archer m
Pritch. Inf. (1861), p. 727, t. 1, f. 18, 19.
(1876), p. 86, t. 4 f .5 ,6 ) . Cleve Sver. Desm (1864), p 486.
Lnndell Desm. Suec. (1871), p. 13. / r ;> ^ e d \ Norges Desm
/'1873) D 6 N o r d s t e d t Desm. Arct. (18/0), p. 41. Petit
S t f ü e L . 'p a r i s (1877), p. 8 1 . Wood F. Water Alg* U^S.
(1872), p. 146. Brebisson Liste Desm. (18o6), p. 120.
Notaris Desm. Ital. (1867), L 2, f. 8.
(1868) p 194. Jacobsen Desm. Denm. (1874:), p. 188.
Kirchner Alg. Sohles. (1878), p. 163.
H ab. In pools.
Sussex, Hants, Surrey, Westmoreland, Cornwall Wales,
Scotland, Ireland; France, Germany, Italy, Sweden, Denmark,
Russian Lapland, United States. , , ^ /
Plate X X V II., fig. 2. a, living frond ; h e, empty fronds ; d, end
view ; e, side view.
'Mic za ste z ia s tzu n c a ta . (Corda) Breh. in Ralfs. Lesm. (1848), p.
75, t. 8, / . 4 ; t. 10, / . 5.
Frond orbicular, smooth, segments five-lobed, basal and
middle lobes obscurely bipartite, extremities bidentate ; end
lobe very broadly cnneate, bidentate at the angles, and with a
slight central concavity.
S i z e . Length 94-107 p ; diam. 84-108 p (K .) p ; diam.,
50-100 p (W.). ; length 106 p ; diam. 100 p (R.). ; length
115 m; diam. 96 M (D.).
Archer in Prit. Inf. (1861), p. 727. Delponte Desm. (1866),
p. 89, t. V., f. 6-10. Cleve Sver. Desm. (1864), p. 487.
Lundell Desm. Suec. (1871), p. 16. Wolle Desm. U.S.
(1884), p. 114, t. 88, f. 6-9. Nordstedt Norges Desm.
(1878), p. 7. Petit Liste Desm. Paris (1877), p. 31. Wood
F. Water Algaj U.S. (1872), p. 145. Wittrook Scan. Desni.
(1869),p. 9. Brebisson Liste Desm. (1856), p. 121. Notaris
Desm. Ital. (1867), p. 82, t. 2, f. 9. Rabh. Alg. Eur. (1868),
p. 191, in part. Jacobsen Desm. Denm. (1874), p. 185.
Kirchner Alg. Sohles. (1878), p. 162.
Cosmarium truncatum, Corda Aim. Carls. (1835), f. 23.
Euastrum rota, Ehr. Inf. (1838), t. 12, f. \,g, li.
Euastrum scutum, Pocke. Phys. Stud. (1854), t. 1, f 14, t.
3, f. 10,11.
Micrasterias semiradiata, Kutz. Sp. Alg. (1849), p. 170.
Micrasterias rotata, Ealfs. Ann. N. Hist. (1844), xiv., t. 6,
f. i. b.
Euastrum semiradiatum, Breb. in Meneg. Syn. Desm. (1840),
Nag. Einz. Alg. (1849), t. 6, f. H. 8.
H ab. In ponds.
Snssex, Hants, Cornwall, Gloucester, Westmoreland, Wales,
Scotland, Ireland ; Germany, France, Italy, Sweden, Denmark,
United States.
Blate XXV., fig. 2. a, living frond ; h, empty frond ; c, side view ;
d, end view.
M ic za ste z ia s c z en a ta . Breb. in Ralfs. Lesm. (1848), p. 75, t. 7, f
2, t. 10, / . 4.
Frond orbicular, smooth, segments five-lobed, basal and
middle lobes usually crenate or sinuate, end lobe very broadly
cnneate, rounded at the ends, entire.
S i z e . Length 106 p ; diam. 96 p (R.) ; length 180 p ;
diam. 86 p (D.) ; diam. 75-85 p (W.).
Grunow Desm. Anstr. (1858), p. 501. Archer in Prit. Inf.
(1861), p. 727. Delponte Desm. (1876), p. 92, t. 5, f. 17, 18.
Wolle Desm. U.S. (1884), p. 113, t. 38, f. 7, 8.
Micrasterias rotata, Ealfs. Ann. Nat. Hist. (1844), xiv.,t. 6,
fig. 1, b (upper fig.)
Micrasterias truncata, var. c., Rabh. Alg. Enr. (1868), p.
191.
■ • ' u