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Studies on some Indian members of the Rhodymeniales

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Relation http://eprints.cmfri.org.in/7091/
 
Title Studies on some Indian members of the Rhodymeniales
 
Creator Kalimuthu, S
 
Subject Theses
Algae
 
Description The order Rhodymeniales is a 'rell-defined group when compared with some of the
other orders of the class, Rhodophyceae. This order consists of rather naturally distinctive
groups (Kylin, 1956; Sparling, 1957). Rhodymeniales currently includes three families viz.
Champiaceae, Lomentariaceae and Rho1dymeniaceae (Silva et al., 1996) .
Schmitz (1889) introduced the order Rhodymeninae with six families :
Sphaerococcaceae, Rhodymeniaceae, Delesseriaceae, Bonnemaisoniaceae,
Rhodomelaceae and Ceramiaceae. Later the Delesseriaceae, Rhodomelaceae and
Ceramiaceae were transferred to ceraliales by Oltmanns (1904). Sjoestedt (1926) erected
a new order Sphaerococcales for he Sphaerococcaceae and Kylin (1928) placed
Bonnemaisoniaceae in Nemalionales.
The order Rhodymeniales is ,haracterised by the procarp bearing one or two
auxiliary-cell branches composed of 0 cells (except for Epymenia obtusa which bears
three-celled ones), which are initiated directly from the supporting cell before fertilisation.
However, these cell branches become distinctive generally only after fertilisation. The algal
thallus is flattened or slightly flattened, cylindrical or hollow, and shows multiaxial growth with
meristems located at the apex or margin. Tetrasporangia occur either terminally or
intercalarily in the cortical layer and are divided cruciately or tetrahedrally (except Coeloseira
which bears polysporangia). Spermalangia originate from superficial cortical cells.
Cystocarps are surrounded by a perica)p with ostiole. The life cycle is generally of triphasic
haplodiplontic type i.e. Polysiphonia-type.
 
Date 2000
 
Type Thesis
NonPeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/7091/1/TH-79_Kal.pdf
Kalimuthu, S (2000) Studies on some Indian members of the Rhodymeniales. ["eprint_fieldopt_thesis_type_phd" not defined] thesis, Bharathidasan University, Tiruchirappalli.