Gills consist of threadlike structures called filaments. The spores rapidly germinate to produce long, branching threadlike structures, called hyphae. Gills are tissues which consist of threadlike structures called filaments. The pathogen may also survive in debris as threadlike strands called hyphae. Rhizomorphs are threadlike structures in fungi that are made up of hyphae. Leaf shape may be linear, strap like, oblong, elliptic, lanceolate (lance shaped) or filiform (threadlike). Most cerci are segmented and jointed, or filiform (threadlike), but some take very different forms. These insects have four membranous wings and threadlike antennae. The filaments are threadlike, usually pale brown, and often bald. Fire moss reproduces vegetatively via protonemata (threadlike or platelike growths). Interspersed among the asci are threadlike sterile cells called paraphyses. The head bears two threadlike antennae and a pair of beady eyes. The flowers are described as "starry bursts of threadlike stamens". A germinated spore develops into a protonema (a branched, threadlike structure). In Nematocera, they are pluriarticulate, threadlike or of feathery type, composed of 7-15 undifferentiated items.