Pseudocryptogonium H. Akiyama & B.C. Tan, 2013

Akiyama, Hiroyuki & Tan, Benito C., 2013, The new synonymy of Horikawaea with Cryptogonium and a proposal of Pseudocryptogonium, gen. nov. (Musci, Pterobryaceae), Phytotaxa 98 (1), pp. 16-22 : 21

Pseudocryptogonium H. Akiyama & B.C. Tan , gen. nov.

Differing from Cryptogonium in having weakly conduplicate foliation, almost plane leaf lamina even at the apices, weak differentiation of leaf alar regions, longer setae 3–4 mm in length, and capsules well exserted beyond the perichaetial leaves.

Type species:— Neckera tjibodensis M.Fleisch., Musci Fl. Buitenzorg 3: 873 (1908)

The monotypic new genus is based on Neckera tjibodensis . It differs from Cryptogonium in having: (1) a weakly conduplicate foliation and a plane (not cucullate) leaf lamina and apices; (2) development of very short double costae (except for C. phyllogonioides ); and (3) longer setae and capsules exserted beyond the perichaetial leaves. See Lin (1984a) for more details. Its differences from the superficially similar genus, Neckera Hedw. , have been well elaborated by Ji & Enroth (2006).

1. Pseudocryptogonium tjibodensis (M.Fleisch.) H.Akiyama & B.C.Tan , comb. nov. ( Figs. 20–23 ).

Basionym: Neckera tjibodensis M.Fleisch., Musci Fl. Buitenzorg 3: 873 (1908) Ξ Horikawaea tjibodensis (M.Fleisch.) M.C. Ji & Enroth, J. Bryol. 28: 167 (2006). “Type:— INDONESIA. Java: Tjibodas, detex F. (holotype FH-herb. Fleisch.!, isotype L).”

Horikawaea redfearnii B.C.Tan & P.J.Lin, Trop. Bryol. 10: 59 (1995), fide Ji & Enroth (2006). “ Type:— PHILIPPINES. Palawan: Aborlan Municipality, Barangay Aporawan , Sitio Daan , Mt. Tinikbasan (ca. 2000 ft), 27 Apr., 1992, B.C.Tan & W.S.Gruezo 92-739 (holotype FH!, isotypes BO!, BM!, CAHUP!, H!, IBSC!, L!, MO!, NY!, US!).”

Other specimens examined:— CHINA. Hainan Island: Changjiang Co., Bawanglin Forest Reserve, 1000-1100 m elev., P.L.Readfearn 35918 (FH!); ibid., Mt. Jiangfengling, P.C.Chen et al. 431g (IBSC!).

Distribution. Philippines (Palawan), Indonesia (Java), China (Hainan).

Note. In Pseudocryptogonium tjibodensis , the totally naked dormant buds are surrounded by single-celled wide, unbranched filamentous pseudoparaphyllia. Asexual reproductive organs were not found among the specimens examined. Molecular phylogenetic analyses including the new genus (as Horikawaea redfearnii ) show a low bootstrap support in a clade with Cryptogonium phyllogonioides , but a close relationship with members of the family Pterobryaceae ( Cox et al. 2010 fig.1-B, Wang et al. 2010, fig.1).

Figures

FIGURES 17–32. 17–19; Cryptogonium nitidum (holotype of Horikawaea nitida). 20–23; Pseudocryptogonium tjibodensis (holotype of Horikawaea redfearnii). 24–26; C. phyllogonioides (H.Akiyama C-10140). 27; C. dubium (left; H.Akiyama China-1335) and C. phyllogonioides (H.Akiyama C-10140). 28–29; C. phyllogonioides (holotype of Neckera phyllogonioides). 30–32; C. phyllogonioides (lectotype of Phyllogonium cylindricum).