| Melanothamnus harveyi | |
|---|---|
 | |
Scientific classification  | |
| (unranked): | Archaeplastida |
| Division: | Rhodophyta |
| Class: | Florideophyceae |
| Order: | Ceramiales |
| Family: | Rhodomelaceae |
| Genus: | Melanothamnus |
| Species: | M. harveyi |
| Binomial name | |
| Melanothamnus harveyi (Bailey) Díaz-Tapia & Maggs | |
| Synonyms | |
Polysiphonia harveyiBailey | |
Melanothamnus harveyi (Polysiphonia harveyi), Harvey's siphon weed, [1] is a small marine red alga in the division of Rhodophyta.
Melanothamnus harveyi is a small marine alga which grows in tufts no more than 10 centimetres (3.9 in) high. The erect branches are formed by a central axis surrounded by four perecentral cells of the same length. A cortex may develop by cells growing downwards in the grooves between the perecentrals. Latteral branches are usually dense. The holdfast is a disk of downgrowing filaments from which further erect branches develop. The general appearance is very variable. [2]
This species is dioecious, meaning that individuals either have male or female reproductive systems. Spermatangial axes develop on trichoblasts. The cystocarps are globular borne on wide stalks. Tetrasporangia occur in series near the tips of the branches. [2]
Melanothamnus harveyi grows epiphytically on other algae as well as on artificial material. [2]
This species can be found in England, Scotland, Ireland, Norway, France, Denmark and the east coast of North America. [2] [3]
Osmundea pinnatifida is a species of red alga known by the common name pepper dulse.
Polysiphonia lanosa is a common species of the red algae (Rhodophyta) often to be found growing on Ascophyllum nodosum.
Polysiphonia atlantica is a small filamentous species of red marine algae Rhodophyta. The thalli form small tufts up to 3 cm long. The axes are ecorticate consisting of axial cells surrounded by four periaxial cells.
Polysiphonia denudata is a small red alga, Rhodophyta, growing as tufts up to 20 cm long without a main branch axis.
Polysiphonia elongata is a small red marine algae in the Rhodophyta.
Polysiphoides fucoides (Hudson) Greville is a common marine alga in the Division Rhodophyta.
Polysiphonia furcellata (C.Agardh) Harvey is small marine red alga in the Division Rhodophyta.
Polysiphonia nigra is a species of marine alga in the division Rhodophyta.
Polysiphonia stricta is a small red marine alga in the Division Rhodophyta.
Vertebrata subulifera is rather small marine alga in the division Rhodophyta.
Vertebrata fruticulosa(Boergeseniella fruticulosa Kylin) is a small marine alga in the Division Rhodophyta.
Ceramium botryocarpum is a small red marine alga in the Division Rhodophyta.
Ceramium echionotum is a small marine alga in the division Rhodophyta.
Ceramium secundatum is a small marine red alga.
Ceramium shuttleworthianum is a small marine red alga.
Ceramium virgatum, or the red hornweed, is a small red marine alga.
Brongniartella byssoides Schmitz is a small red marine alga.
Membranoptera alata a small red alga in the Rhodophyta.
Phyllophora sicula, the hand leaf bearer, is a small red marine alga.
Gymnogongrus griffithsiae is a small uncommon seaweed.