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Bryophyte Flora of Altai Mountains. Viii Arctoa (1998) 7: 85-152 BRYOPHYTE FLORA OF ALTAI MOUNTAINS. VIII. BRACHYTHECIACEAE ÌÎÕÎÎÁÐÀÇÍÛÅ ÀËÒÀß. VIII. BRACHYTHECIACEAE MICHAEL S. IGNATOV1 ÌÈÕÀÈË Ñ. ÈÃÍÀÒÎÂ1 Abstract The family Brachytheciaceae in Altai is represented by 8 genera and 33 species: Brachythecium buchananii, B. cirrosum, B. collinum, B. complanatum, B. dovrense, B. erythrorrhizon ssp. asiaticum ssp. nov., B. falcatulum, B. glaciale, B. latifolium, B. mildeanum, B. oedipodium, B. ornellanum, B. plumosum, B. populeum, B. reflexum, B. rivulare, B. rotaeanum, B. rutabulum, B. salebrosum, B. starkei, B. trachypodium, B. turgidum, B. velutinum, Bryhnia novae-angliae, Cirriphyllum piliferum, Eurhynchium altaicum sp. nov., E. angustirete, E. hians, E. pulchellum, Homalothecium philippeanum, Myuroclada maximowiczii, Platyhypnidium riparioides, Scleropodiopsis laxiretis gen. et sp. nov. For each species de- scriptions, illustrations, and distribution and habitat preferences in Altai are provided. Ðåçþìå Ñåìåéñòâî Brachytheciaceae íà Àëòàå ïðåäñòàâëåíî 8 ðîäàìè è 33 âèäàìè: Brachythecium buchananii, B. cirrosum, B. collinum, B. complanatum, B. dovrense, B. erythrorrhizon ssp. asiaticum ssp. nov., B. falcatulum, B. glaciale, B. latifolium, B. mildeanum, B. oedipodium, B. ornellanum, B. plumosum, B. populeum, B. reflexum, B. rivulare, B. rotaeanum, B. rutabulum, B. salebrosum, B. starkei, B. trachypodium, B. turgidum, B. velutinum, Bryhnia novae-angliae, Cirriphyllum piliferum, Eurhynchium altaicum sp. nov., E. angustirete, E. hians, E. pulchellum, Homalothecium philippeanum, Myuroclada maximowiczii, Platyhypnidium riparioides, Scleropodiopsis laxiretis gen. et sp. nov. Äëÿ êàæäîãî âèäà äàíî îïèñàíèå, èëëþñòðàöèè, îïèñàíî åãî ðàñïðîñòðàíåíèå è õàðàêòåðíûå ìåñòîîáèòàíèÿ íà Àëòàå. INTRODUCTION perichaetial leaves usually without or with This paper continues the series started in weak costa and non-plicate (an exception is the third volume of Arctoa. For the explana- Brachythecium reflexum with costa reaching tion of specimen citations and review of na- to nearly the apex); (5) seta long, with mature ture conditions in this area see Ignatov (1994). capsule raised high above perichaetium; (6) The Brachytheciaceae is well delimited from peristome double, endostome complete to some- other pleurocarpous families except Meteori- times reduced, and then with cilia short to ab- aceae (Ignatov, 1998). It includes pleurocarpous sent and very rarely segments absent; (7) ex- mosses with: (1) a specific arrangement of ostome teeth usually deeply brownish or red- pseudoparaphyllia around the branch primor- dish in lower part or throughout. dia, with the first pseudoparaphyllium pointed Plants of the Brachytheciaceae in Altai vary downward, and the second and the third de- from small (Brachythecium collinum) to robust veloping at about 120° from the first one (Figs. (B. turgidum, Eurhynchium angustirete), grow- 2-4,6, 8, 9, 11-13, etc., see also Ignatov, 1998); ing on soil and rocks, humus, decaying wood, (2) paraphyllia absent; (3) leaves with more tree bases, and relatively rarely high on tree or less developed costa, rarely (in tropical gen- trunks (Brachythecium rotaeanum, B. popu- era) with costa very short to absent; (4) lam- leum), sometimes submerged in running water inal cells smooth, rarely prorate, but never pap- (Platyhypnidium riparioides). Branching is illose, typically elongate (2)4-10(15):1 ; (5) principally pinnate, but all species also devel- 1 – Main Botanical Garden of Russian Academy of Sciences, Botanicheskaya 4, Moscow 127276 Russia – Ðîññèÿ 127276 Ìîñêâà, Áîòàíè÷åñêàÿ 4, Ãëàâíûé áîòàíè÷åñêèé ñàä ÐÀÍ 86 M. S. IGNATOV 1 3 5 6 2 4 Fig. 1. Transverse sections of stem leaves: 1-2 – Homalothecium philippeanum (Spruce) B. S. G. (from Ignatov 21/ 32a); 3-4 – Brachythecium salebrosum (Web. et Mohr) B. S. G. (from Ignatov 0/1646); 5-6 – Platyhypnidium riparioides (Hedw.) Dix. (from Ignatov 1/35): 1 – 7500x; 2 – 1850x; 3 – 7500x; 4 – 1400x; 5 – 9000x; 6 – 1200x. op sympodial branches, i. e. branches which con- size, whereas in Bryhnia they differ also in shape. tinue their growth and branching further (3) In Eurhynchium hians the stem leaves are (branch initials are always present on both stem small in un-branched portions of creeping stems and branches). In some species (Brachythecium and larger in branching portions. The branch rivulare, Bryhnia novae-angliae) sympodial leaves have a more ovate shape, are more rigid, branches are numerous and usually orthotropous, form a wider angle with the stem, and usually resulting in a subdendroid habit of the plants. have the same size as stem leaves. A similar pat- In Myuroclada maximowiczii, Platyhypnidium tern can be observed in creeping phenotypes of riparioides, Homalothecium philippeanum, and E. pulchellum and some other species. some phenotypes of Brachythecium plumosum The foliage is typically subjulaceous, some- the branching is irregular and the “branches” times clearly julaceous (Myuroclada, Brachyth- are indistinguishable from the “stem” (cf. Figs. 2, ecium cirrosum), or the branches are ±complan- 36, 42). In some species (i. e., Eurhynchium hians, ate, for example in Brachythecium oedipodium, E. pulchellum) the stems are partly unbranched, B. velutinum, and Eurhynchium hians. A com- with much smaller leaves and such creeping planate foliage mostly depends on a prostrate stoloniferous zones alternate with normal pin- growth in shady habitats and all these species nately branched zones. The differentiation of can develop subjulaceous branches when grow- leaves within one plant may show several pa- ing orthotropous (in more dense growth, etc.). terns: (1) In most species of Brachythecium, The•leaves are usually lanceolate to ovate, rarely Eurhynchium pulchellum, E. angustirete, Cirr- suborbicular (in Myuroclada and sometimes in iphyllum, etc., the branch leaves are smaller, nar- Bryhnia), acute to acuminate, and sometimes rower, more strongly serrate, and the costal spine abruptly contracted into a piliferous acumen longer on abaxial surface, and the laminal cells (Cirriphyllum piliferum, Brachythecium cirro- are narrower than in the stem leaves. Leaves on sum), concave to plane, and plicate to non-plicate. sympodial branches are intermediate in their Plicae are mostly due to the pattern of later- characters between stem and branch leaves. (2) al contacts of laminal cells (Fig. 1). In Homal- In plants with primarily sympodial branching othecium the cells are ovate in transverse sec- (Bryhnia, Myuroclada) the leaves are differen- tions, and are joined with the neighbouring cells tiated within single shoots, but the differentia- only along about a half the cell height. In Platy- tion between stem and branch leaves is indis- hypnidium riparioides, Eurhynchium hians, etc., tinct. In Myuroclada the leaves differ mainly in the cells are nearly quadrate in transversal sec- The family Brachytheciaceae in Altai 87 tion, and the cells are joined along the entire and perforated segments, and well developed cell height. This does not allow plicae to devel- cilia (except Homalothecium). Whereas naked op. Brachythecium is an intermediate case. Pli- calyptras are typical, hairy ones are found in cae mostly start from bends in the leaf insertion Brachythecium complanatum (hairy calypras are (the sharper these angles, the more distinct are known in a few Homalothecium, Bryhnia, and the plicae). In some species (e. g., Homalotheci- other Brachythecium species from outside of um, Brachythecium salebrosum) the plicae are Altai). Small to medium-sized and papillose, almost all longitudinal. In species with strongly rarely smooth spores are typical in the family. concave leaves (e. g., Brachythecium complana- COMMENTS ON TERMINOLOGY, tum), the convex surface of the basal leaf is nev- MEASUREMENTS AND ILLUSTRATIONS er perfectly smooth and variously oriented folds Sympodial branch – branch which gradu- occur throughout (Figs. 19-20). ally starts “stem-like” growth, with subsequent At their base the leaves are shortly to longly branching. Leaves of sympodial branches often and narrowly to broadly decurrent. However, have characters transitional between stem and decurrencies are not always observed in de- branch leaves. In some collections of species tached leaves, because they remain attached to with extensive sympodial branching it is diffi- stem. The study of a stem with partly detached cult to find “real” stem leaves. leaves is the best way to study leaf decurrencies. Pseudoparaphyllia are here considered sensu The leaf margin is serrate to entire. The costa lato, including all foliose structures around ends at 0.2 to 0.95 way up leaf, usually a little branch initial, and are not differentiated here above mid-leaf, in the branch leaves (rarely in from scaly, or embryonic leaves (cf. Ignatov, stem leaves) the costa ends in a tooth (rarely a 1998). few teeth). Lamina cell shape varies from linear Axillary hairs. The measurements were made to rhombic in the upper part of the leaf or, in on the better developed hairs only. Myuroclada, in most of the leaf, smooth or, in Width of laminal cells includes the width Bryhnia, with prorate upper cell ends. of lumen plus width of cell wall; the widths of Autoicous, diocous, rarer polyoicous (B. two latter are indicated in brackets. mildeanum, B. rotaeanum) and phyllodioicous Seta and capsule length were measured from (Eurhynchium pulchellum) species occur, or some- the dry herbarium specimens; capsule length times the sexual condition is not stable within a does not include operculum. species. The
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