naviculis laevibus ( ? ) pauois vel numerosis, linearibus utrinque rotund
a tis, in cellulis gelatinosis continuis acorvatiin nidulantibus.
Long. Xavicularum '/loo— '/«<•'“ > acervulorum diam. 1—2 " et ultra.
Hab. in mari septentrionali.
t t Gelatina plus minus ineniliranaeea ct fo lla c ca (pliycoma).
A A V I I .M i c l i . i e i a Berkeley (1844) : Lrustiila illis Stauroneis
similia, valvis ellipticis transverse striatis et nodulo centrali plus minus stau-
ronciformi instructa, in massa gelinea membranacea irregulariter sparsa.
— Conf. Fig. nostr. 69.
D. ulvoides Berle, ot R a lfs (in Ann. and Mag. XIV. T. X. Sm.
Diat. II. p. 6 6 . T. L iy . F. 342. Pritoh. .Inf. p. 925. Ï . XV. F. 31.
Heib. Consp. p. 79.). D. frustulis oblongis plerumque geminatis,
utroque flue tru n ca tis , obtusangulis, valvis ellipticis apicibus obtuso-
rotundatis, linea media recta, nodulo centrali transverso marginem v e rsus
extenso lin e a ri, striis transversis subtiliter granulatis 36—40 in
0,001 . Phycoma '¡'i 3 " longum, foliaceum, subfusoum, oblongum,
basi stipitatum, ambitu undulato-laciniatum. Conf. Fig. nostr. 69.-2. a d.
Long, valvarum ‘/ss— Voo'" = 0,00104 — 0,00147", lat. 0,00036
—0,0005".
Hab. in paludibus litoralibus, ad oras Sootiae prope Aberdeen.
D. p in n a ta R a lfs (1. c. VIII. T. v. P. 6 . Sm. 1. c. F. 348.).
D. frustulis oblongo-quadrangulis obtusangulis, valvis elliptico-lanceolatis
ad utrumque finem attenuatis et obtusis, linea media recta, nodulo centrali
subrotundo, striis transversis parallelis reotis lineam mediam attingon-
tibus 40—42 in 0,001". — Phycoma 1 — 2 " longum, olivaceum, foliaceum,
irregulariter lobatum, lobis subpinnatifidis. v. s. — Conf. Fig.
nostr. 69. 1. a et b.
Long, valvarum i/ioo— V « " ' = 0 ,0 0089—0,00118".
Hab. ad oras Angliae.
t t t Gelatina ram ifica ta , filamentosa.
AAVIIA Berkeleya Grev. (1827); Frustala navicularia,
anguste lineari-lanoeolata, apicibus obtusis, nodulo centrali parvo rotund
a to , in phycoma gelatinosum molle filamentosum inclusa et fasciatim
dense aggregata. Conf. Fig. nostr. 6 8 .
B. frag ilis Grev. (Scot. Crypt. Flor. T. 294. Brit. Flor. p. 416.
Sm. Diat. II. p. 67. T. LIV. P. 344. Xavicula fragilis Heib. Consp.
p. 84. ^ Bangia micans Lyngb. Hydr. danic. p. 84. Xord. Alg. 9 . (teste
Heibergio.). P. valvis lineari-lanceolatis indistincte striatis, v. s.
Long, i/ss— Vm" ' = 0,0015—0,0035".
b. a d ria tic a Ktz. (Bac. T. 22 F. IV. a. b. 1 - 4 . ) , nulla alia re
nisi solo phycomate, ramulis flagelliformibus a forma typica distiuota.
Hab. ad oras Angliae, Galliae (prope Cherbourg: De Brébisson),
Daniae, Lusitaniae, in mari mediterraneo et Adriatioo.
AAIA. Scllizonema Agardh (1824); Frustula navicularia,
recta vel sigmatoidea, nodulo centrali rotundato, quadrangulo vel transverse
lin e a ri-extensa (stauroneiformi), in tubo gelineo simplici vel mul-
toties diviso et ramificato in scries longitudinales ordinata (Frons, phycoma).
(Colletonema, Xaunema, Monema, Monnema et Micromega Autor.).
A. Phycoma gelatinosum amorphmn vel lila tuhulosa
simplicia s. subsimplicia formans. (Colletonema Brébisson).
Conf. Fig. nostr. 6 6 .
a. F ru s tu la r e c ta , exacte Naviculam effln g en tia , lin e a media re cta.
Sch. v u lg are Thwaites (in Ann. and Mag. I. T. X II. Colletonema
vulgare. Sm. Diat. I I . p. 70. T. LVI. F. 351. Pritch. Inf. p. 926.
Pabenh. Alg. X. 1406. Xavicula vulgaris Heib. Consp. p. 83. X. 18.).
S. valvis elliptico-lanceolatis sub polis leniter constrictis, apicibus obtu
s is , nodulo orbioulari, linea media recta, striis transversis parallelis
reotis vel subradiantibus lineam mediam attingentibus 72 in 0,001". v. v.
Long. 1/49— Vm'" = 0 .0 0 1 8 —0 ,0030" (sec. Smith). Longitudinem
speciminum germanioorum non u ltra 0,0026" semper reperi.
Hab. in aquis duloibus per totam Europam passim.
Sch. neglectum (Colletonema neglectum Thwaites 1. c. Sm. 1. c.
F. 352.). Sob. valvis laneeolatis vel elliptico-lanceolatis, sub polis vix
constrictis, apicibus obtusis, nodulo centrali minimo, linea media triplici,
striis transversis validis parallelis subrectis, 8 6 — 40 in 0 ,001", lineam
mediam externam attingentibus. v. s.
Long. V s s -V s i'" = 0 ,0 0 1 5 -0 ,0 0 2 4 " .
Hab. in aquis dulcibus Angliae, Galliae passim abundanter e. gr.
prope Falaise (De Brébisson).
Sch. subcohaerens (Thwaites 1. 0. Sm. 1. c. F. 353. Pritoh. Inf.
p. 926.). Sch. valvis oblongis, apicibus p a rum ‘ attenuatis subtruncato-
ròtiindatis, nodulo centrali parvo rotundato area parva laevi cincto,
striis transversis validissimis subradiantibus lineam mediam non attingentibus
28 in 0,001". V. s.
Long. V1 10 - V 51 '" = 0,0008—0,00155", lat. 0,00035".
Phycoma glohosum, diam. 0,2—0,6".
Hab. in aqua dulci Angliae (prope Wareham, Dorset; W. Smith).