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A. Zygosporae laeves.
a, Indiridua singula.
Individua libere natantia vel muco matrioali involuta.
UM M I. I f a l l l l O g l o e a Ktz. (1843) : Cellulae oblongae, ellipticae
vel cylindrieae, utroque polo rotundatae, medio n o n constrictae, plerumque
in muco gelatinoso nidulantes, liberae, singulae vel in familias con-
sooiatae, lamina chloropliyllacea axili vel excentrioa, aetate provecta
medio constriota, denique divisa praditae. Propagatio fit tum sporis
perduran*libus eopulatione productis, tum divisione transversali.
(Mesotaenium Naegeli (1849), Triohodictyon Ktz.)
Conf. Fig. nostr. 52.
* C e llu la e in a q u a lib e r e n a ta n t e s , p le rum q u e s p a r s a e ,
sin g u la e .
P. Endlicheriana (Mesotaenium Endlicher ianum Naeg. einz. Alg.
p. 109. T. VI. B.). P. cellulis cylindriois, utroque polo subito late
rotundatis, laevibus, diametro 3 — 4 -pio longioribus; plasmate achroo,
lamina chlorophyllacea laete viridi.
Diam. '/250 — V200'" = 0,00035 — 0,00044".
Hab. in fossis, paludibus.
Individua nova (post divisionem faotam) per aliquot tempus polis
saepius cohaerentia.
** C e llu la e in f am i l ia s c o n s o c ia ta e , in s u b s t a n t i a g e la tin o s a
m a t r io a li n id u l a n t e s .
P. microcoeca Ktz. (Tabul. phycol. I. p. 20. T. 25. F. V. non
exaote !). P. bryophila cellulis ovalibus elliptioisve, in polos obtuse
rotundatos s e n s im a t t e n u a t i s , diametro plerumque duplo longioribus ;
plasmate achroo, lamina chlorophyllacea axili viridi ; zygosporis obtuse
angularibus. v. v.
Diam. V364 — -1/20.0 " ' = 0,00024 — 0,00044".
Hab. in gelatina mucosa viridi in muscis, trunois musoosis etc.
P. macrococca Ktz. (Phycol. germ. p. 153. Tabul. phycol. I. p. 19.
A. Braun Verj. p. 349. T. I. Eabenli. Alg. N. 545 ! et 869 (sub
P. dimorpha!), P. protuberans (Sm.) Ktz. 1. 0 . Cocooohloris protuberans
Spreng. Syst. veg. IV. p. 373. Palmella protuberans Grev. Soot. Flor. Y.
F. 1. Bréb. Alg. Fal. p. 39. Mesotaenium Brauuii de By Conj. p. 74.
T. VII. A. F. 1 — 8. Eabenh. Alg. N. 906!). P. cellulis oyiindricis
utroque polo s u b ito tu n o a to - r o tu n d a ti s , diametro 2— 2 '/2 -plo
longioribus; lamina chlorophyll, axili, laete viridi, margine saepe inaequaliter
dentato ; plasmate achroo ; zygosporis obtuse angularibus. v. v.
Diam. '/u3 — V120'" = 0,00062 — 0,00074".
b. minor de By (1. 0. F. 9 — 11.), subduplo minor.
Hab. in substantia gelatinosa obscure viridi, in rupibus, musois, etc.
per Europam passim.
P. violascens Rahenh. (Kiypt. Fior, von Saohson p. 167. Meso-
tacnium violascens de By. Conj. p. 74. T. VII. B. Rabenh. Alg.
N. 907!). P. terrestris, saxícola, bryophila, in gelatina fusco-violacea
nidulans ; cellulis ovatis vel ovato-elliptiois, polos versus sensim attenuatis,
apicibus rotundatis; lamina chlorophyll, juxta axin longitudinalem, integra;
plasmate pallide violaceo ; zygosporis obtuse angularibus. v. v.
Diam. Vi62 — (T4i'" = 0,00059 — 0,00063".
Hab. in muscis, liohenibus, passim.
P. chlamydospora de By (in Eabenh. Alg. N. 511. Mesotaenium
chlamydosporum de By Conj. p. 75. T. VII. D.). P. terrestris, in
gelatina viridi nidulans ; oellulis cylindriois, utroquo polo truncato-
rotundatis , laete viridibus, diametro 1 ’ (2 — 8 - pio longioribus ; lamina
chlorophyll, fusiformi excéntrica ; plasmate achroo vel fuscesoente ;
zygosporis maturis globosis vel obtuse angularibus, fuseis, membrana
extema ampMa sacouliformi instructis. v. s.
Diam. ' Ì9o'" = 0,00047".
b. Archeri (P. chlamydospora var. /?. Archer in Mior. Journ. 1864.
p, 124. T. 1. F. 1 — 19.), praeoedenti simillima, terrestris, massam
mucosam viridem effusam formans, oellulae aeque oylindraoeae, utroque
polo subito late rotundatae, magnitudine illam aequantes ; lamina ohloro-
phyllacea fusiformis integerrima, laete viridis, juxta axin longitudinalem,
nonnunquam oblique disposita ; plasma grosse granulatum, achroum vel
luteo - viridulum ; zygosporae maturae luteo-fusoae, angulares, membrana
ovata ampia dilute fuscescente Involuoratae.
Hab. in loois glareosis, prope Walldorf ad Francofurtum ad
M. detexit cl. de Bary ; b. ad Dublin in Hibernia.
P. mirifica (Mesotaenium miriñoum Archer in Micr. Journ. 1864.
p. 130. T. I. F. 20 — 31.). P. saxícola, gelatinosa, luteolo - viridis ;
cellulis late ellipotiois, polos versus sensim attenuatis, apicibus rotundatis,
diametro duplo longioribus ; lamina chlorophyll, anguste fusiformi,
excéntrica, integerrima, saturate viridi, saepius curvata ; plasmato granuloso.
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