Thirtyeight taxa of Orthotrichum Hedw. (thirtysix species and two varieties) are reported from Southeast Asia. Seven species (O. pulchrum Lewinsky, O. tortifolium Lewinsky, O. taiwanense Lewinsky, O. erosum Lewinsky, O. schoddei Lewinsky, O. subpumilum Lewinsky, O. sinuosum Lewinsky), one variety (O. hookeri var. granulatum Lewinsky) and one combination (O. laevigatum Zett. var. japonicum (Iwats.) Lewinsky) are new. A section Callistoma Iwats. & Sharp is elevated to the rank of subgenus Callistomum (Iwats. & Sharp) Lewinsky. The remaining taxa reported are: O. firmum Vent., O. hookeri Mitt., O. brassii Bartr., O. dasymitrium Lewinsky, O. leiolecythis C. Muell., O. striatum Hedw., O. speciosum Nees, O. rupestre Schwaegr., O. sordidum Sull. & Lesq., O. affine Brid., O. obtusifolium Brid., O. exiguum Sull., O. anomalum Hedw., O. cupulatum Brid., O. ibukiense Toy., O. urnigerum Myr., O. griffithii Dix., O. crispifolium Broth., O. hooglandii Bartr., O. alpestre B.S.G., O. erubescens C. Muell., O. meyenianum Hamp., O. revolutum C. Muell., O. pallens Brid., O. pumilum Sw., O. rogeri Brid., O. crenulatum Mitt., O. callistomum B.S.G. All species are described and illustrated. A key is provided.
The species are montane in Kashmir, the Himalayas, southeastern China, Taiwan and New Guinea, found between ca. 2.000 and 4.000 m; in Japan, Korea and eastern China they are also present at sea level. Taxa from the southern region are of Gondwanalandic origin, whereas those of the northern parts are identical with or closely related to those of mainly Northern Hemispheric distribution.
SEM-studies of peristomes of O. griffithii, O. crispifolium, O. hooglandii, O. callistomum and O. tortifolium support their apomorphic character.
The response of two Sphagnum species to copper chloride and zinc chloride was investigated in laboratory experiments which used both field shoots and axenic cultures. Both species behaved similarly. The LD50 for S. cuspidatum, estimated by regression, was 3.6 μM for copper and 33 μM for zinc, equivalent to tissue dry weights of 300 μg Cu++ g-1 and 2600 μg Zn++ g-1. The LD50 values were reduced when the supply of nutrients, particularly nitrogen, was restricted. The response of Sphagnum palustre to either metal was not changed markedly when grown in the presence of epiphytic algae.
Fourteen new hepatic records are reported for the Philippines, of which two are new genetic records (Cephaloziella and Reboulia), and three are new for science: Frullania kalimantanensis Piippo & Hatt., F. rizalii Piippo & Hatt. and Plagiochila benitoi Inoue ex Piippo.