Lacomucinaea lineatum flowers form a five-pointed star in both the bud and open flower stages. When still a bud, the star is visible in the five seams of the petals that meet neatly in the centre point of the bud, showing the outside surfaces of the petals. The open flower shows its star in the inside surfaces of its five, pointed, spreading, petal lobes.
The calyx of L. lineatum is fused to the ovary. The tubeless corolla is radially symmetrical, its triangular lobes up to 1,5 mm long while the corolla diameter is about 3 mm.
The five stamens have their filaments emerging from the seam between the disc and the corolla, the ovary inferior. The thread-like style is only 0,8 mm long, ending in a two-lobed stigma positioned at the level of the anthers.
The fruiting pedicels of L. lineatum do not enlarge to form an elaiosome as is common in many Thesium species. These smooth, fleshy fruits would therefore not be expected to be distributed by ants but in some other way. The fruit is a drupe upon which the brown remains of the corolla persist.
The stem surfaces of the plant have longitudinal lines, striations that form part of the assessment that removed Thesium lineatum from Thesium and placing it in its own genus, Lacomucinaea. The striations are caused by fibres inside raised ridges on the stems (Lacomucinaea, a new monotypic genus in Thesiaceae (Santalales) by Nickrent and Garcia, 2015, Researchgate; Vlok and Schutte-Vlok, 2010).
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