Polysiphonia denudata | |
---|---|
Polysiphonia denudata specimine | |
Scientific classification | |
(unranked): | Archaeplastida |
Division: | Rhodophyta |
Class: | Florideophyceae |
Order: | Ceramiales |
Family: | Rhodomelaceae |
Genus: | Polysiphonia |
Species: | P. denudata
|
Binomial name | |
Polysiphonia denudata (Dillwyn) Greville ex Harvey
|
Polysiphonia denudata (Polysiphonia variegate (C.Agardh) Zanardini) is a small red alga, Rhodophyta, growing as tufts up to 20 cm long without a main branch axis. [1]
Polysiphonia denudata is erect with repeatedly branched axes. Each branch consists of a central axis with 5 to 7 elongated pericentral cells all of the same length. Cortication occurs lower down, these corticating cells grow down in the grooves between the pericentral cells. The holdfast is discoid. [1]
The plants are dioecious. They bear spermatangia towards the tips of branches. Cystocarps are barrel-shaped when mature borne on a wide short stalk. Tetrasporangia occur in a spiral series in the branches near the tips. [1]
The alga is very rare, grows on rock, stones or other large algae in the low-littoral or below in sheltered sites. [1] [2]
Reported from the north of Ireland in 1847, the specimen is in store in the Ulster Museum, Belfast [3] in England from the south coast, [4] Scottish records considered misidentifications, [5] Netherlands to Portugal and West Africa. The Mediterranean and west Atlantic. [1]
Bunker, F.StP.D., Maggs,C.A., Brodie, J.A., Bunker, A.R. 2017. Seaweeds of Britain and Ireland. Second Edition. Wild Nature Press, Plymouth. UK. ISBN 978-0-9955673-3-7
Polysiphonia denudata | |
---|---|
Polysiphonia denudata specimine | |
Scientific classification | |
(unranked): | Archaeplastida |
Division: | Rhodophyta |
Class: | Florideophyceae |
Order: | Ceramiales |
Family: | Rhodomelaceae |
Genus: | Polysiphonia |
Species: | P. denudata
|
Binomial name | |
Polysiphonia denudata (Dillwyn) Greville ex Harvey
|
Polysiphonia denudata (Polysiphonia variegate (C.Agardh) Zanardini) is a small red alga, Rhodophyta, growing as tufts up to 20 cm long without a main branch axis. [1]
Polysiphonia denudata is erect with repeatedly branched axes. Each branch consists of a central axis with 5 to 7 elongated pericentral cells all of the same length. Cortication occurs lower down, these corticating cells grow down in the grooves between the pericentral cells. The holdfast is discoid. [1]
The plants are dioecious. They bear spermatangia towards the tips of branches. Cystocarps are barrel-shaped when mature borne on a wide short stalk. Tetrasporangia occur in a spiral series in the branches near the tips. [1]
The alga is very rare, grows on rock, stones or other large algae in the low-littoral or below in sheltered sites. [1] [2]
Reported from the north of Ireland in 1847, the specimen is in store in the Ulster Museum, Belfast [3] in England from the south coast, [4] Scottish records considered misidentifications, [5] Netherlands to Portugal and West Africa. The Mediterranean and west Atlantic. [1]
Bunker, F.StP.D., Maggs,C.A., Brodie, J.A., Bunker, A.R. 2017. Seaweeds of Britain and Ireland. Second Edition. Wild Nature Press, Plymouth. UK. ISBN 978-0-9955673-3-7