given the right conditions, into the gametophyte stage, the prothallus. The prothallus develops independently for several weeks; it grows sex organs...

Prothallus: A green, photosynthetic structure that is one cell thick, usually heart or kidney shaped, 3–10 mm long and 2–8 mm broad. The prothallus produces...

non-thallophyte plants – clubmosses, horsetails, and ferns is termed "prothallus". Homothallism Heterothallism Wengania Haupt, Arthur W. (1953). Plant...

and grow into a rather inconspicuous plant body called a prothallus. The haploid prothallus does not resemble the sporophyte, and as such ferns and their...

produces spores) is followed by a haploid generation (the gametophyte or prothallus, which produces gametes). Pteridophytes differ from bryophytes in that...

products known as thysanophora unknowns, and the conspicuous white, fibrous prothallus that encircles the thallus. The species was first formally described as...

is a species of corticolous, squamulose lichen. It has a reddish brown prothallus, medium sized green granules with isidia, and narrow ellipsoid simple...

pale green to white areoles (up to 0.4 mm in diameter) and a thin, white prothallus. Isidia are frequent, cylindrical to flask-shaped (lageniform), with dimensions...

independent sporophytes. Young fern sporelings can often be found with the prothallus gametophyte still attached at the base of their fronds. Conidium (mitospore)...

in being corticolous, having adpressed squamules on a distinct, dark prothallus, lacking melanins, having a thin cortical layer and a simpler apical ascus...

tree. It has a whitish grey thallus without a cortex and also without a prothallus. It is similar to Carbacanthographis aptrootii, but unlike that species...

wart-like texture. The thallus may be continuous or somewhat cracked, with a prothallus that ranges from pale to dark grey. The apothecia (fruiting bodies) are...

a smooth and somewhat shiny, pale yellowish-grey thallus that lacks a prothallus and covers areas of up to 12 cm (4.7 in) in diameter. The presence of...

tropical regions. They are commonly known as map lichens because of the prothallus forming border-like bands between colonies in some species, like the common...

a smooth and somewhat shiny, pale yellowish-grey thallus that lacks a prothallus and covers areas of up to 7 cm (2.8 in) in diameter. The ascomata are...

The lichen has an orange-tinged, white thallus with an orange-brown prothallus. Its ascomata are in the form of short lirellae with carbonised walls...

found in the forest understory. It has a light grey thallus lacking a prothallus and a cortex. Its ascospores, which number eight per ascus, are oblong...

with almost no lobes; it is never powdery or pruinose. A light coloured prothallus may be visible in well-developed specimens. Apothecia are small and either...

smooth and shiny, dark brown thallus that is surrounded by a dark brown prothallus and covers areas up to 7 cm (3 in) in diameter. It has pear-shaped (pyriform)...

carmine red, lacking pseudocyphellae (small pores on the surface) and a prothallus (a border around the thallus). The ascomata are superficial (situated...

and .3-.1 mm wide lobes that have an abrupt margin at the edge, and no prothallus. It lacks isidia or soredia. Apothecia may be immersed in the thallus...

(thallus) the appearance of a mosaic of small polygons. A rim of dark tissue (prothallus) may surround the edges of the lichen. The fruiting body parts (apothecia)...

somewhat glossy, and lacks pseudocyphellae (tiny pores on the surface) and a prothallus (a thin border around the thallus). The ascomata are emergent (partially...

lichen has a whitish to pale beige thallus lacking both a cortex and a prothallus. It has hyaline ascospores that measure 170–200 by 12–16 μm; these spores...

pale greenish-grey thallus with a cortex and a thin (0.1 mm wide) black prothallus line. It covers areas of up to 4 cm (1.6 in) in diameter. The presence...

old-growth rainforest. The lichen has a dull yellowish thallus lacking a prothallus, with spherical to pear-shaped ascomata that are either immersed in or...

and swollen (bullate), and surrounded by a thin (~0.3 mm wide) black prothallus. It has pear-shaped (pyriform) ascomata, measuring 0.7–1.1 mm in diameter...

somewhat shiny, bullate, olive-green thallus with a cortex but lacking a prothallus; it measures up to 7 cm (2.8 in) in diameter. The presence of the lichen...

conspicuous chocolate-brown fringe of loose hyphae up to 2 mm wide (the prothallus). The photosynthetic partner is a filamentous green alga of the genus...

rainforest. The lichen has a dull, glaucous-white thallus, lacking a prothallus. The ascospores are hyaline, ellipsoid, and measure 69–80 by 25–35 μm;...