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. 2023 Nov 28;14:1260596. doi: 10.3389/fpls.2023.1260596

Figure 2.

Figure 2

(A) A. dorsal surface; B. ventral surface; Plate 78, fig. 18 from Dillenius (Dillenius, 1741). (B) Riccia natans (Fringed Riccia), plate 77 in Smith’s English Botany (Smith, 1804). (C) Riccia natans, Plate LXXI, fig. V of (Bischoff, 1835). (1) Mature frond; (2-3) fronds split into two halves along the intermediate groove, each half consisting of two unequal parts; (4) the sporangium; (5) developing spores; (6) mature spores; (7, 10) scale; (8) sporangium within thallus; (9) thallus cross section within antheridium (A). (D) Riccia natans (plant juvenile), Plate LXX, fig. VI of (Bischoff, 1835). (1-3) Young fronds with quadricrenate apex, convex on both sides, attenuated on the outer edge, with an intermediate groove running out into two lateral grooves from the notches; (4) ventral side of 3; (5) frond cross section with young scales (A). (E, F) Riccia natans, from Plate XXXI of (Lindenberg, 1836). (E) 6. cross section of mature frond. (F) 2. Mature frond; (9) sporangium; (left) mature spores. (G) Riccia lutescens, from Plate XXVI of (Lindenberg, 1836). (1, 3) Mature frond; (4) ventral view; (5) enlarged view of 4; (6) thallus cross section.