William Campbell Steere

Tetraplodon paradoxus and T. pallidus (Musci: Splachnaceae) in northern North America

Tetraplodon paradoxus (R.Br.) Hagen was originally described from arctic Canada in 1823 andT. pallidus Hagen, described from arctic Scandinavia in 1893, was reported from the Canadian Arctic Archipelago in 1907. Although the two species are distinct, clear-cut and easily distinguished from other members of the genus, they were almost hopelessly confused both conceptually and nomenclaturally with each other and withT. mnioides (Hedwig) Bruch, Schimper & Gümbel by Hagen in 1910, and his erroneous treatment has been perpetuated by subsequent bryological authors, especially in Scandinavia. Moreover, these two species have been omitted from all comprehensive North American manuals and checklists; the purpose of this paper is to clarify the long-standing confusion and to establish a firm basis for their recognition in the North American bryoflora, from which they have been excluded for far too long. The distinctions between these two species are made clear by means of photographs made from living material, as well as by maps of their geographical distribution in North America.

Four new species of musci from the andes of Ecuador and Colombia

Eobruchia ecuatoriana sp. nov. (Bruchiaceae) has the aspect of a diminutiveTrematodon, but is distinctive in having a mitrate calyptra and flexuous seta;Macromitrium perreflexum sp. nov. (Orthotrichaceae) has ramarkably reflexed leaves, unlike any known species;Lepidopilum pulcherrimum sp. nov. (Hookeriaceae) is distinguished by its large size and beautifully undulate leaves;Symphyodon americanus sp. nov. (Symphyodontaceae) is remarkable in being the first American representative of a genus and family previously known only from Asia; it is most closely related toS. echinatus (Mitt.) Jaeg. of the Himalayas and Thailand.

BRYOPHYTES OF THE NORTHERN YUKON TERRITORY, CANADA, COLLECTED BY A. J. SHARP AND OTHERS

Two hundred and eight taxa of bryophytes, including two hundred and seven species, are reported from extreme northern Yukon. Five hepatic and eighteen moss taxa represent new records for the Yukon, which areAnastrophyllum hellerianum (Nees) Schust.,Scapania degenii Schiffn. in K. Müll.,Riccardia palmata (Hedw.) Carruth.,Mannia sibirica (K. Müll.) Frye & Clark,Sauteria alpina (Nees) Nees,Sphagnum orientale Savich,Dicranum spadiceum Zett.,Anoectangium aestivum (Hedw.) Mitt.,Barbula coreensis (Card.) Saito,B. platyneura C. Müll. & Kindb.,Pottia obtusifolia C. Müll.,Splachnum vasculosum Hedw.,Bryum acutiforme Limpr. ex Hag.,B. bimum (Brid.) Turn.,B. intermedium (Brid.) Bland.,B. neodamense Itzigs.,Cinclidium latifolium Lindb.,Timmia comata Lindb. & Arn.,Orthothecium acuminatum Bryhn,Cratoneuron arcticum Steere,Drepanocladus brevifolius (Lindb.) Warnst.,D. intermedius (Lindb.) Warnst., andD. lycopodioides (Brid.) Warnst. Many of the other collections represent significant extensions of ranges to the arctic sector of the Yukon Territory.

Bryophytes from the southeastern Yukon Territory, Canada

One hundred and forty-five taxa of bryophytes are reported from the extreme southeastern Yukon. Eight species of Hepaticae and 13 of mosses represent new records for the Yukon, which are Calypogeia suecica (S. Arnell & Perss.) K. Müll., Chiloscyphus pallescens (Ehrh.) Dum., Conocephalum conicum (L.) Dum., Jamesoniella autumnalis (DC.) Steph., Pellia neesiana (Gott.) Limpr., Ptilidium pulcherrimum (Web.) Hampe, Riccardia palmata (Hedw.) Carruth., Tritomaria exsecta (Schmid.) Schiffn., Amblystegium varium (Hedw.) Lindb., Brachythecium rivulare B.S.G., B. rutabulum (Hedw.) B.S.G., Bryum blindii B.S.G., Didymodon rigidulus Hedw., D. tophaceus (Brid.) Lisa, Drepanocladus trichophyllus (Warnst.) Podp., Hygroamblystegium noterophilum (Sull. & Lesq. ex Sull.) Warnst., Hygrohypnum molle (Hedw.) Loeske, Plagiomnium ciliare (C. Müll.) Kop., P. cuspidatum (Hedw.) Kop., Platydictya minutissimum (Sull. & Lesq. ex Sull.) Crum, and Pylaisiella selwynii (Kindb.) Crum, Steere & Anderson. Many of the other collections represent wide extensions of range within the Yukon Territory.

Macromitrium crumianum (musci: orthotrichaceae), a new species from guatemala

Northwest of Lake Izabal, Guatemala, G. C. Jones and L. Facey collected in 1966 abundant material of what we have calledMacromitrium crumianum Steere & Buck. This new species is characterized by linear-lanceolate leaves which are long acuminate, with leaf cells which are smooth and linear throughout, a smooth seta and capsule, and a naked calyptra. It is most closely related toM. dubium Schimp. of the West Indies and perhaps also toM. leprieurii Mont. (M. dussii Broth.) of the West Indies, French Guiana and Suriname.