Jankuceraea Ignatov & Ignatova, 2022

Jankuceraea Ignatov & Ignatova View in CoL gen. nov.

Monospecific genus

Jankuceraea pacifica Ignatov & Ignatova , sp. nov.

Type: Russian Far East, Primorsky Territory , Dalnegorsk District , ca. 5 rm N of Sedaya Mt. , 44°36’40.1”N, 135°16’47.8”E; 650 m alt., mixed forest along the road, on rocky soil at roadside, 31 Aug 2013, Ignatov & Ignatova 13-1552. Holotype MHA9011432 About MHA , isotype MW8027413 . Isolate OK 3249. GoogleMaps

Etymology: The generic name is in honor of Jan Kučera (born 1972), an outstanding bryologist from Czech Republic who contributed a lot to the molecular phylogene-

Fig. 6. Jankuceraea pacifica (from holotype): A: distal part of shoot, with not the largest leaves, cf. Fig. 5A; B–D View Fig : stem leaves (from ‘A’), showing prorate upper cell angles; E – H: stem transverse sections, showing hyalodermis and proximal branch leaves, arrowed ( H). tic studies of mosses. The species name refers to the re- ularly pinnate, distantly foliate; branches 3–5 mm long; gion where the type specimen was collected. hyalodermis well-developed, central strand weak; axil-

Diagnosis: Jankuceraea shares with the genus Pod- lary hairs 2-celled, upper cell 13–25×5 µm long; proxiperaea the following character combination: 1) stems with mal branch leaves of branch primordia narrow lanceolate well-differentiated hyalodermis; 2) leaf margins with “com- or subulate. Stem leaves distantly arranged, widely spreadpound” teeth formed of projected angles of two contigu- ing to weakly reflexed, rigid, 0.2–0.4× 0.12–0.17 mm, ous cells; 3) leaf cells with distinct papillae in the upper from ovate or widely ovate base ± abruptly tapered into end of each cell. Its distinctions from Podperaea include: long, narrow lanceolate acumina, rounded to the inser- 1) smaller size of plants; 2) widely spreading, concave, tion, concave, canaliculate distally; margins plane or inrigid leaves with canaliculate acumina vs. reflexed, soft, curved distally, serrate throughout, with simple and “douflexuose, weakly concave leaves; 3) almoist straight or only ble” (formed of projecting angles of two contiguous cells) slightly curved vs arcuate capsules. teeth; costae short, double; cells elongate-rhomboidal,

Description: Plants small, green or yellowish-green, 15–30×5–6 µm, 3–6:1, prorate or with distinct papillae in small loose mats. Stems prostrate, to 1 cm long, irreg- in the upper end of each cell on dorsal surface, alar cells small, quadrate and short rectangular, in a small, indistinctly delimited groups. Autoicous. Inner perichaetial leaves 1.0× 0.35 mm, straight, oblong, wide, abruptly constricted into short, narrow lanceolate acumina, smooth; margins plane, entire; costae single, thin, to 0.7 the leaf length. Setae 1.0– 1.5 cm, reddish-brown. Capsules ca. 1 mm long, reddish-brown, inclined or pending, almost straight or slightly curved, cylindrical, constricted below mouth when empty, smooth. Operculi conic. Annuli deciduous by fragments. Peristome perfect: exostome teeth ca. 320 µm long, striolate below, papillose above; endostome with basal membrane ca. 150 µm high, segments wide, keeled, slightly shorter than exostome teeth, cilia long, appendiculate. Spores 12–15 µm.

Other specimen examined: Russia, Kuril Islands , Kunashir Island , NW slope of Ruruj Volcano, Dalny Creek, 50 m alt., fir forest, on steep slope to stream, on rocks and on soil nearby. 27 Aug 2006, Ignatov 06-1901 ( MHA9011335 About MHA , MW9056505 ) .

Differentiation: Superficially, Jankuceraea pacifica looks like a small Campylophyllopsis sommerfeltii : such small leaves may occur in the latter species at shoot ends, especially in plants growing in deep shade or otherwise unfavorable conditions. However, in Jankuceraea such foliage is uniform throughout a tuft, and also its leaves are uniformly remote. Differences of J. pacifica from Podperaea krylovii are given in the diagnosis. In addition, stem leaves of J. pacifica are shorter: 0.3–0.4 mm vs. 0.4–0.9 mm long, as well as leaf cells: 15–28 µm vs. 30– 55(–75) µm long.

The maximally similar structure, according to description of Kanda (1975) has Campylium pulchrum Kanda , a moss from Hokkaido, known by holotype. The detailed illustrations of Kanda show only simple teeth along the leaf margin. The type of this species was been studied by Hedenäs (1997), who found it conspecific with Campylophyllopsis hispidula , which supports the absence of any outstanding features in this taxon. Hedenäs (1997) also found some inconsistense between the holotype and the description in protologue.

Distribution. Our first specimen of the Jankuceraea was collected in 2006 in Kunashir Island, South Kuril Islands. This was a strongly depauperate thin plant, which however had clear double teeth at leaf margins and distantly papillose cells, and therefore it was identified and reported as Podperaea krylovii ( Bakalin et al., 2009) .

Later this specimen was sequenced and turned out to be strikingly different form Podperaea , but closer to Campylophyllopsis . The imperfect collection did not allow us to decide if this is simply an abnormal morphotype or something else.

In the course of the further studies, we collected a large sample of this species in the Primorsky Territory, which helped to reveal its taxonomic identity.

Two localities of Jankuceraea have rather little in common and both look rather average in the Far Eastern region. In Kunasuir, the shore of the Sea of Okhotsk is steep ( Fig. 8C View Fig ), with narrow canyons, and Jankuceraea was collected on rocks in open fir forest at 50 and 200 m elev. In Primorsky Territoy, Middle Sikhote-Alin mountain range, the species was collected on gravely soil bank not far from a road in the conifer ( Pinus, Larix ) forest, at 650 m elev. ( Fig. 8A, B View Fig ). Campylophyllosis sommerfetlii was as an admixture in some collections of this species.

* * * Other Species of Campylophyllopsis in Russia