CHROMOSOME DATA ON AUSTRALASIAN BRYACEAE

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  Chromosome numbers in Australasian taxa of the family Bryaceae are now available for eight species of the genus Bryum, for five species of the genus Rosulabryum and for a single species in each of the genera Orthodontium, Brachymenium, Leptobryum and Pohlia from Australia. Data are also given for two species of Bryum from New Zealand and for two species of Rhodobryum from Papua New Guinea.

  Reported here for the first time in the Southern Hemisphere are chromosome numbers for seven species of Bryum (B. argenteum Hedw. n＝10, B. australe Hampe n＝11 (10＋m), B. caespiticium Hedw. n＝30, B. clavatum (Schimp.) C. Muell. n＝11 (10＋m), B. creberrimum Tayl. n＝30 from Australia; B. blandum J. D. Hook. & Wils. n＝11 and B. sauteri B. S. G. n＝10 from New Zealand). First reports of chromosome numbers are also given for two species of Rosulabryum (R. subtomentosum (Hampe) Spence n＝10, 11 (10＋m) R. sp. nov. (A) Spence n＝11 (10＋m)) and Pohlia aff. nutans (Hedw.) Lindb. n＝22 from Australia while n＝10 is recorded for both Rhodobryum aubertii (Schwaegr.) Ther. and R. giganteum (Schwaegr.) Par. from Papua New Guinea.

  Additional cytotypes to those previously published were found in several new populations of Brachymenium preissianum (Hampe) Jaeg. [n＝10], for a single population of Bryum pachytheca C. Muell. [n＝20] and for two populations of Orthodontium lineare Schwaegr. [n＝20] . Additional counts, based on studies of new populations that confirm previous reports for Australian taxa, are given for Bryum dichotomum Hedw. n＝10, Rosulabryum billardierei (Schwaegr.) Spence (Bryum billardierei Schwaegr. var. billardierei) n＝10, Rosulabryum subfasciculatum (Hampe) Spence (Bryum subfasciculatum Hampe) n＝10 and Rosulabryum torquescens (Bruch ex De Not.) Spence (Bryum torquescens Bruch ex De Not.) n＝20, 21 (20＋m).