28 
Diam. 0,066 mm. Diam. nucl. 0,039 mm. (Tab. XXVII. fig. 127. B). Stigmarienkohle. 
Subdivisio XXIX. Exosporium aequaliter incrassatum, membranaceum late apertum. Nucleus indu- 
dumento reticulari-lacunoso aut perforrato lacunoso involutus. 
277. Corpus trianguläre, angulis late rotundatis. Exosporium membranaceum, late apertum saepius 
implicatum, Vs nuclei diametri crassum. Indumentum nuclei extra margines nuclei prominens lacunoso- 
perforratum, marginibus inciso-dentatis. 
Diam. 0,14 mm. Diam. nucl. 0,087 mm. (Tab. XXIII. fig. 49. A). Metschowk. Lewino. 
278. Corpus trianguläre, angulis late rotundatis. Exosporium membranaceum late apertum, ple- 
rumque marginibus implicatis, 2 / 3 nuclei diametri crassum. Indumentum nuclei extra margines nuclei pro¬ 
minens lacunoso perforatum et furfuraceo-volvatum, marginibus integerrimis. Exosporii pars centralis in 
prominentia 3 a radialia marginibus crenulatis producta. 
Diam. 0,157 mm. Diam. nucl. 0,066 mm. (Tab. XLIX. fig. 49. F). „Stigmarienkohle . u 
279. Corpus trianguläre, angulis late rotundatis. Exosporium membranaceum, late apertum, ple- 
rumque marginibus radialiter implicatis, l l 2 (et paulo magis) diametri nuclei crassum. Indumentum nuclei 
extra margines nuclei prominens reticulato-lacunosum, areolis latis angulatis. Exosporii pars centralis in 
prominentica terna radialia usque fere ad angulos pertinentia producta. 
Diam. 0,151 mm. Diam. nucl. 0,069 mm. (Tab. XXIII. fig. 49. D). Lewino, Kurakinskije, Metschowk 
(Rossia Centralis). 
Subdivisio XXX. Exosporium aequaliter incrassatum, porosum, lacunoso-verruculosum, et reticulato- 
lacunosum. 
f Exosporium porosum et lacunoso-verruculosum. 
280. Corpus trianguläre. Exosporium x / 3 nuclei diametri crassum, lacunoso-verruculosum. Nucleus 
verruculosus. 
Diam. 0,125 mm. Diam. nucl. 0,069 mm. (Tab. XXIII. fig. 50. D). 
281. Corpus trianguläre. Exosporium i/ 3 —V 4 nuclei diametri crassum, poroso-lacunosum. Nucleus 
indistinctius limitatus lacunosus. Exosporii pars media in prominentia 3 a liniformia triangulariter posita 
usque ad angulos pertinentia producta. 
Diam. 0,118 mm. (Tab. XXI. fig. 1. G). Metschowk. 
ff Exosporium reticulato-lacunosum. 
282. Corpus trianguläre, angulis late rotundatis. Exosporium reticulato-lacunosum, lacunis angu- 
losis, marginibus apiculatis, V 2 diametri nuclei crassum. Nuclei indumentum trilamellosum. In plurimis 
speciminibus nucleus in utroque latere densissime apparet inductus plantula parasitica ex filis pluriramu- 
losis compressis com posita et haec parasita, in similiaritate structurae cum Aigis recentibus non ullo modo 
consentiens, est delineata in Tab. LXXVII. fig. 6 densissime adpressa ad nuclei superficiem. 
Diam. 0,27 mm. Diam. nucl. 0,148 mm. (Tab. XXIV. fig. 50. G. Specimen 0, magn. fig. a. Exo¬ 
sporii marginis pars major aucta). Metschowk. 
fff Exosporium lacunoso-perforatum. 
283. Corpus irregulariter ovato-ellipticum. Exosporium lacunoso-perforatum, inaequaliter incras¬ 
satum, usque 1 I 2 nuclei diametri crassum. Nuclei indumentum trilamellosum. Nucleus irregulariter trian- 
gularis lacunoso-verruculosus, fissuris late volvatis. 
Diam. long. 0,354 mm. Diam. lat. 0,25 mm. Diam. nucl. 0,148 mm. (Tab. XXIV. fig. 65. A). Met¬ 
schowk. 
ff ff Exosporium cribrose-perforatum. 
284. Corpus irregulariter trianguläre, marginibus irregulariter undatis. Exosporium 1 / 2 — :2 / 3 diametri 
crassum, lacunis radialiter positis longioribus ad margines decrescentibus cribroso-perforatum. Nucleus 
regulariter triangularis, angulis late rotundatis, verruculoso-exasperatus. 
Diam. 0,125 mm. Diam. nucl. 0,05 mm. (Tab. XX. fig. 1. F). „Stigmarienkohle.“ 
I 
