Apoglossum ruscifolium

Apoglossum ruscifolium is a small red marine seaweed.
Description.
"Apoglossum ruscifolium" has branched monostromic blades growing to 10 cm long. The axis branches with primary blades reaching 10 cm long and up to 0.8 cm wide, each with a clear midrib and pointed apices. Lateral veins are microscopic. The species is similar to "Membranoptera alata" and "Hypoglossum hypoglossoides" but can be clearly distinguished. The branches of "H. hypoglossoides" are clearly pointed and the young blades of "M.alata" are not pointed and are asymmetric with pincer-like tips.
Reproduction.
Microscopic sori are formed are microscopic and are formed on either side of the midrib. Female cystocarps occur singly on the frond.
Distribution.
Recorded all around Great Britain and Ireland including Shetland, the Isle of Man and the Channel Islands. Norway to the Mediterranean, the South Atlantic and Indian Oceans.