1. Die Arten der Gattung Caloplaca mit pluriloculären Sporen werden taxonomisch und nomenklatorisch revidiert und geschlüsselt. Es wird die Meinung vertreten, daß die Arten nicht als eigene Gattung abgetrennt werden können, da außer der Zahl der Loculi keine weiteren durchgehenden Unterschiede bestehen. Die pluriloculären Sporen scheinen vielmehr in verschiedenen Sektionen der Gattung Caloplaca entstanden zu sein. 17 Arten und 1 Unterart werden anerkannt.

2. Von sämtlichen bekannten Sippen werden schematische Apothecienquerschnitte und die Sporen abgebildet; von Caloplaca ochracea, C. brebissonii, C. homologa, C. erythroleuca, C. erythroleucoides und den beiden Unterarten von C. crocea werden Fundpunktkarten vorgestellt.

3. Die meisten Arten sind nur von wenigen Fundpunkten bekannt, nur Caloplaca ochracea in Europa und die südhemisphärische C. crocea wurden öfters gesammelt.

4. Caloplaca araguana, C. oahuensis und C. crocea ssp. mexicana werden neu beschrieben.

5. Caloplaca brebissonii, C. crocea, C. kauaiensis, C. subdecadens, C. tetramera und C. vainioi sind neue Kombinationen oder neue Namen.

  The growth of Sphagnum fimbriatum Wils. was studied in aseptic cultures with 17 dipeptides given as the only nitrogen sources. Only glycyl-aspartic acid and glycyl-glutamic acid were nearly as good nitrogen sources as inorganic nitrogen (NH₄NO₃). Growth was rather weak in most cases, but only leucyl-tyrosine was toxic. Methionine-containing dipeptides were usually among the poorest nitrogen sources. This bog moss was fairly tolerant of a hydroxyproline-containing dipeptide (prolyl-hydroxyproline). The ability to use dipeptides efficiently is not so good in this species as in some other green plants studied, but on the other hand S. fimbriatum is more tolerant of a fairly wide range of compounds than, e.g., Drosera rotundifolia.

  A method is given for the visualization of externat conduction in liverworts and mosses. The plants are irradiated with blue light. The progression of fluorescein solutions over the specimens is observed and photographed through an orange-yellow barrier-filter.

  A new, robust species of Jungermannia (subg. Plectocolea) with strikingly characteristic grapecluster oil-bodies has been found in coastal British Columbia, Canada, and Washington and Alaska, U.S.A. The species, described here as J. schusterana, appears to have an affinity with a group of three species of Jungermannia endemic to Japan.

  Five species of the family Mniaceae, Cinclidium stygium Sw. (C. subantarctium Roiv., syn. nov.), Mnium marginatum (With.) P. Beauv., Plagiomnium cuspidatum (Hedw.) T. Kop., P. ellipticum (Brid.) T. Kop. and P. rhynchophorum (Hook.) T. Kop. occur in South and Central America. The synonymy of P. rhynchophorum includes Mnium rostratum (Schrad.) T. Kop. var. americanum Hampe, M. rostratum var. ligulatum Herz., M. rostratum var. occidentale Hampe, M. chloroloma C. Müll., M. rigidulum C. Müll., M. ligulatum C. Müll., M. orbifolium C. Müll., M. fluviatile C. Müll., M. marginatulum C. Müll., M. microblastum C. Müll., and M. rhynchomitrium C. Müll.; all are syn. nov.

  Radula brunnea Steph., an East Asian member of the section Amentulosae, is reported for the first time in North America. Extensive mats of this distinctive species were found on Saddle Mountain in northwestern Oregon, U.S.A.