Bryocladia thwaitesii (Harvey ex J.Agardh) De Toni 1903

    Thallus caespitose, erect, feathery texture, dark brown in colour, 3-6 cm height. Thallus arising from plexus creeping filaments and anchored by monosiphonous rhizoids with discoid foot. Creeping filaments produce erect filaments on the dorsal side and rhizoids on the ventral side. Erect filaments setose, uniform in thickness, without laterals at the basal portions and densely branched above. Thallus grows by means of dome shaped apical cell, 8 - 12 µm height and 10 -17µm width. In young, some segments of the axis give rise to uniseriate filaments with repeatedly forked trichoblasts. Primary branches sometime simple, or ramified, often pinnate; branchlets short, straight or recurved, ultimate ones subulate. Segments of primary branches with 6-7 pericentral cells, twice as along as broad; lower portions with 10-12 pericentral cells. Tetrasporangia in secondary lateral, one per segment forming a straight linear series. Tetrasporangia tetrahedral, spherical measures 36 µm and 55 µm.