FIGURE 1 - uploaded by Yong-Ying Liu
Content may be subject to copyright.
Propagules variation. A: Pohlia lutescens (from Chen S.K. 5145, PE); B-E: Pohlia drummondii (B-C: from Zhang D.C. 675, KUN, D-E: from Zhang D.C. 152, KUN); F-J: Pohlia andalusica (from Mamtimin 15524, HBNU). Scale: A=50 μm; B-E=457 μm; F-J=100 μm.
Source publication
A taxonomic study of the propaguliferous species of the genus Pohlia with axillary and rhizoidal propagules in China is presented. Structure in the variation in size and form of the propagules provides a basis for distinguishing species although developmental variations often exist in the propagules. Ten species are recognized in the study area, in...
Contexts in source publication
Context 1
... μm wide at base; upper and middle laminal cells linear to vermicular, 70-100 × 6-9 μm, thin-walled, mostly unchanged towards the base. Propagules light reddish-brown, spherical to ellipsoid, knobby, unicellular, 40-45 × 25-35 μm, usually arranged on the rhizoids similar to beads ( Figure 1A). Toruloid rhizoidal tubers occasionally produced in leaf axil of lower part of stem. ...
Context 2
... acuminate; margins usually revolute at base, serrate at apex; costae percurrent, 40-50 μm wide at base; upper and middle laminal cells rhomboidal, 61-90 × 7-12 μm, thin-walled; basal cells rectangular, undifferentiated or somewhat narrower in one row towards the margins. Propagules single in 1-3(5) leaf axils in upper part of sterile plant; short-oblong when young, elongate during growth, becoming cylindrical, usually twice as long as wide, 555-1155(1900) μm length; green when young, reddish to reddish-brown when mature, sometimes black when dry, opaque; leaf primordia green to yellow, laminate, scattered on the propagule body ( Figures 1B-E). Dioicous. ...
Context 3
... μm wide at base; distal laminal cells rhombic to rhomboidal, 60-75 × 6-10 μm, thinwalled; medial laminal cells longer than the distal, 60-80 (95) × 6-10 μm; proximal laminal cells rectangular, (30) 40-50 (55) × 8-13 μm. Propagules arising in clusters of 3-5 in a few leaf axils in upper part of sterile plant; obconic, green when young, and oblong to ovate, brown to reddish when mature, opaque to translucent, 210-300 (400) ×(75) 90-145 μm; 3-5 triangular, laminate leaf primordia restricted to the apex (Figures 1F-J). Dioicous. ...
Citations
... A group of species in the genus Pohlia Hedwig (Mielichhoferiaceae Schimp.) produce specialized asexual propagules and the characters of propagule were used to distinguish various species (Cao and Zhao 2009;Liu et al. 2018). The habitat and the gametophyte characters of these species are very similar. ...
... They revised the propaguliferous species of Pohlia from Central and South America and presented the morphological illustrations and photomicrographs of six species with axillary gemmae and one with rhizoidal tubers (Suárez and Schiavone 2011a). Liu et al. (2018) presented the taxonomic study of ten species of Pohlia with axillary and rhizoidal propagules in China, including two new records: P. andalusica (Höhn.) Brotherus and P. andrewsii A.J. Shaw. ...
... arising only in the apex, green to pale, erect) leaf primordia. The gemmae of P. tibetana are rather like those of P. andrewsii from Arctic regions (Shaw 1981b(Shaw , 2015Liu et al. 2018). Nevertheless, P. andrewsii is distinguished from the new species by its glossy leaves and densely clustered gemmae. ...
A new propaguliferous moss species, Pohlia tibetana X.R.Wang & X.M.Shao (Mielichhoferiaceae), from Tibet, southwest China, is described. The new species differs most saliently from other species of Pohlia by its combination of slender plants, loosely attached leaves and axillary solitary, and dark red and flower-like gemmae. In this paper, the line drawings, photographs, habit of the new species are provided and a morphological comparison of it with the similar species is made.
... In shape and size, the propagula of these two species are virtually identical, and they represent a striking case of evolutionary convergence. However, typically the bulbils of B. glacierum have a darker and larger body [dark redbrown, (86) 120-155 × 57-93 (104) μm], and shorter leaf primordia, commonly equal in length to the body, whereas the bulbil bodies of Pohlia hisae are usually light-brown to yellow-green, 53-115 (183) × 43-60 (79) μm, with leaf primordia being one to two lengths of the body (Liu et al. 2018). especially, P. hisae can readily be distinguished from the new species by its narrower leaves with toothed margins and narrower leaf cells. ...
The form of the gemmae appears to be constant within Bryum species, and it is an important character for distinguishing among closely related species. In this study, we describe a new species of Bryum, B. glacierum Y.Y. Liu & Y.H. Wu, that was collected from Tianshan Mountain in China along with a description of its gemmae. This species is distinguished morphologically by (1) gemmiforfm to julaceous shoots; (2) broadly ovate leaves, strongly concave, with obtuse to acuminate apex, plane and undifferentiated leaf margins, rhombic to rhomboidal distal and medial cells; and (3) dark red-brown, obconic or ovate bulbils with peg-like leaf primordia, densely clustered in the leaf axils of sterile shoots. The new moss species is currently known from two localities in northwestern China. The species seems to prefer high altitudes, growing as a pioneer mainly on ground exposed by retreating glaciers. The principal distinctive characters that separate Bryum glacierum from similar species of Bryum and Pohlia are discussed. An identification key for bulbiferous species of Bryum in China is provided.
... In this special issue, Schlesak et al. (2018) accommodate their finding of a paraphyletic genus Hypnum Hedwig (1801: 236) by describing four new genera, one of which named Jochenia in honor of Jochen. The moss genus Pohlia Hedwig (1801: 171) in China is topic of Liu et al. (2018). Finally, Renzaglia et al. (2018) unite liverworts and mosses in their essay by pointing out the morphological features supporting the increasingly important 'setaphyte' hypothesis (mosses and liverworts monophyletic; Renzaglia & Garbary 2001). ...
This special issue of Bryophyte Diversity and Evolution is dedicated to Jochen Heinrichs (1969–2018) in commemoration of his outstanding contributions to bryology. His work spanned a diverse spectrum of topics that will be reflected in this special issue by 10 research papers. Therein, and in honor of Jochen, the moss genus Jochenia gen. nov. (Schlesak et al. 2018), the liverwort species Frullania heinrichsii sp. nov. (Atwood et al. 2018), as well as the liverwort amber fossil Geocalyx heinrichsii sp. nov. (Katagiri 2018) are introduced to the scientific community.
Pohlia leucostoma (Bosch & Sande Lac.) M. Fleisch. has been identified and described as a new addition to the bryoflora of India from Govind Wildlife Sanctuary, Uttarkashi, Uttarakhand. The taxon is characterized by acrocarpous, bright green, glossy plants with linear and filiform leaf propagules with 1-2 peg-like leaf primordia, forming clusters in leaf axils at the apex of stem.
