Cylindrocarpon gillii, a new combination for Septogloeum gillii on dwarf mistletoe

1973 ◽  
Vol 51 (10) ◽  
pp. 1997-1998 ◽  
Author(s):  
John A. Muir
Keyword(s):  
North America ◽  
Spore Formation ◽  
New Combination ◽  
Western North America ◽  
Dwarf Mistletoe ◽  
Anthracnose Disease

The fungus previously known as Septogloeum gillii D. E. Ellis which causes an anthracnose disease of the shoots of dwarf mistletoes (Arceuthobium spp.) in western North America is assigned, on the basis of its conidiophore morphology and spore formation, to the genus Cylindrocarpon. Accordingly, the new combination Cylindrocarpon gillii (D. E. Ellis) J. A. Muir is proposed.

scholarly journals Callus Culture of Arceuthobium americanum Nutt. ex Englem. and Explant Response to Varying Auxin and Cytokinin Concentrations

2012 ◽  
Vol 21 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Lyssa L. Martin ◽  
Cynthia Ross Friedman ◽  
Ronald G. Smith
Keyword(s):  
North America ◽  
Callus Culture ◽  
Shoot Organogenesis ◽  
Coniferous Forests ◽  
Western North America ◽  
Laboratory Studies ◽  
Dwarf Mistletoe ◽  
Arceuthobium Americanum ◽  
Infected Area

The lodgepole pine dwarf mistletoe Arceuthobium americanum is a severe pest in coniferous forests of western North America.  To facilitate laboratory studies of this obligate parasite, a modified White’s medium was used for in vitro culture; the concentrations of IAA and Kn were varied to determine optimal IAA/Kn ratios.  It was found that explant health was related to the concentration of IAA (p = 0.008), but not Kn (p = 0.937), and that explants were healthiest at an IAA/Kn ratio of 0.1.  Radicular apices were generated at IAA/Kn ratios of 1.0 or greater, but no shoot organogenesis was observed.  These data suggest that A. americanum is more sensitive to auxins than cytokinins.  Parasites of plants are known to secrete high levels of cytokinins, which stimulate the host to shuttle nutrients to the infected area, and so we suspect that A. americanum has reduced cytokinin sensitivity.   Key words: Callus culture, Arceuthobium americanum, Explant, Response, Cytokinin, Insensitivity   D.O.I. 10.3329/ptcb.v21i1.9557   Plant Tissue Cult. & Biotech. 21(1): 1-10, 2011 (June)

CERATOZETIDAE OF THE WESTERN NORTH AMERICAN ARCTIC

1985 ◽  
Vol 117 (11) ◽  
pp. 1287-1366 ◽  
Author(s):  
Valerie M. Behan-Pelletier
Keyword(s):  
North America ◽  
North American ◽  
New Genus ◽  
New Combination ◽  
Western North America ◽  
North American Arctic

AbstractThe Ceratozetidae of arctic western North America, represented by 12 species in 9 genera, are discussed. A new genus, Cyrtozetes, and species, Cyrtozetes denaliensis, are proposed, and Trichoribates copperminensis Hammer, T. polaris Hammer, Svalbardia paludicola Thor, Iugoribates gracilis Sellnick, Diapterobates notatus (Thorell) both adults and immatures, D. variabilis Hammer, Sphaerozetes arcticus Hammer, Fuscozetes sellnicki Hammer, Melanozetes longisetosus Hammer, and Ceratozetes spitsbergensis Thor and C. parvulus Sellnick are redescribed. Immatures of T. polaris, S. paludicola, F. sellnicki, and M. longisetosus are described. Distribution records of Ceratozetes gracilis (Michael) in the western North American arctic are listed. The new combination, Cyrtozetes shiranensis (Aoki and Fujikawa), is proposed.

Fire and dwarf mistletoe (Viscaceae: Arceuthobium species) in western North America: contrasting Arceuthobium tsugense and Arceuthobium americanum

Botany ◽  
2017 ◽  
Vol 95 (3) ◽  
pp. 231-246 ◽  
Author(s):  
David C. Shaw ◽  
Michelle C. Agne
Keyword(s):  
North America ◽  
Pinus Contorta ◽  
Forest Disturbance ◽  
Fire Suppression ◽  
Forest Composition ◽  
Western North America ◽  
Dwarf Mistletoe ◽  
Arceuthobium Americanum ◽  
Primary Determinant ◽  
Composition Structure

Dwarf mistletoes (Viscaceae: Arceuthobium spp.) and fire interact in important ways in the coniferous forests of western North America. Fire directly affects dwarf mistletoes by killing the host, host branch, or heating/smoking the aerial shoots and fruits. Fire is a primary determinant of dwarf mistletoe distribution on the landscape, and time since fire controls many aspects of dwarf mistletoe epidemiology. Conversely, dwarf mistletoes can influence fire by causing changes in forest composition, structure, and fuels. Prescribed fire is important for management of dwarf mistletoes, while fire suppression is thought to have increased dwarf mistletoe abundance in western forests. Two dwarf mistletoes are compared in order to illustrate fire interactions in Oregon and Washington, USA: Arceuthobium americanum Nutt. ex Engelm. (lodgepole pine dwarf mistletoe) and Arceuthobium tsugense (Rosendahl)(western hemlock dwarf mistletoe). Arceuthobium persists on the landscape where the host is not killed by fire. Arceuthobium americanum spreads directly into the regenerating Pinus contorta Dougl. ex Loud., while A. tsugense persists in refugia for 200 years or more following fire. Host successional status is a driver of fire – dwarf mistletoe interactions, but forest disturbance agents also play a role. Given the importance of these interactions to the ecology of fire-prone forests, dwarf mistletoes warrant inclusion in disturbance ecology research.

SPECIES OF SOOTY MOLDS FROM WESTERN NORTH AMERICA

1955 ◽  
Vol 33 (5) ◽  
pp. 497-514 ◽  
Author(s):  
Margaret E. Barr
Keyword(s):  
New Species ◽  
North America ◽  
New Combination ◽  
Developmental Study ◽  
Western North America ◽  
New Variety ◽  
Emended Description

A study of a capnodiaceous fungus occurring on western conifers resulted in the investigation of several new or little-known species. This paper includes an emended description and developmental study of Limacinia alaskensis Sacc. and Scalia, from Alnus and various conifers. The following new species, new combination, and new variety are also described from western hosts: L. multiseptata sp. nov., Capnodium spongiosum sp. nov., L. moniliforma (Fraser) comb. nov., and L. moniliforma var. quinqueseptata van nov.

The late-surviving ‘duck-billed’ dinosaur Augustynolophus from the upper Maastrichtian of western North America and crest evolution in Saurolophini

2014 ◽  
Vol 152 (2) ◽  
pp. 225-241 ◽  
Author(s):  
ALBERT PRIETO-MÁRQUEZ ◽  
JONATHAN R. WAGNER ◽  
PHIL R. BELL ◽  
LUIS M. CHIAPPE
Keyword(s):  
North America ◽  
Distal Region ◽  
New Combination ◽  
Cranial Morphology ◽  
Western North America ◽  
Central California ◽  
Skull Roof ◽  
New Tribe ◽  
Anatomical Information ◽  
Upper Maastrichtian

AbstractWe amend the taxonomy and provide new anatomical information on the hadrosaurid dinosaur Saurolophus morrisi (upper Maastrichtian Moreno Formation, central California, USA) derived from full preparation of the referred skull roof. The cranial morphology of this species is distinct enough to justify the new combination Augustynolophus morrisi gen. nov. The morphology of the nasals and surrounding cranial bones indicates that A. morrisi sported a solid nasal crest ending in an elongate triangular plate that extended above the skull roof. Autapomorphies include a crescentic base of the frontal caudodorsal process and extension of the process caudal to the frontal ‘dome’; distal end of nasal crest with knob-like process inflected rostrally; circumnarial depression lightly incised and weakly emarginated, adjacent to caudolateral margin of nasal and occupying two-thirds the width of lateral surface of distal region of crest; and caudal surface of distal nasal crest subrectangular. We formally establish the new tribe Saurolophini consisting of Prosaurolophus, Augustynolophus and Saurolophus. Saurolophin synapomorphies include a premaxilla with broad arcuate contour of rostrolateral region of thin everted oral margin and flat and steeply inclined occlusal surface of dentary dental battery, among other characters. Saurolophin crests evolved towards increasing caudodorsal length, along with caudal extension of the circumnarial fossa and involvement into the crest of adjacent facial elements. Augustynolophus is the second described genus of North American late Maastrichtian hadrosaurids. Its recognition implies a greater diversity among late Maastrichtian dinosaur faunas than previously recognized and is congruent with hypotheses of endemism and/or provinciality during Late Cretaceous time.

scholarly journals Phylogenetic placement and lectotypification of Pseudotryblidium neesii (Helotiales, Leotiomycetes)

2020 ◽  
Vol 5 (1) ◽  
pp. 139-150
Author(s):  
A. Suija ◽  
M. Haldeman ◽  
E. Zimmermann ◽  
U. Braun ◽  
P. Diederich
Keyword(s):  
Phylogenetic Analysis ◽  
North America ◽  
Geographical Distribution ◽  
Sequence Data ◽  
Abies Alba ◽  
New Combination ◽  
Its Sequence ◽  
Western North America ◽  
Phylogenetic Placement ◽  
North Western

A phylogenetic analysis of combined rDNA LSU and ITS sequence data was carried out to determine the phylogenetic placement of specimens identified as Pseudotryblidium neesii. The species forms a distinct clade within Dermateaceae (Helotiales, Leotiomycetes) with Rhizodermea veluwiensis and two Dermea species. The geographical distribution of this species, previously known only from Europe on Abies alba, is extended to north-western North America where it grows exclusively on A. grandis. The name P. neesii is lectotypified in order to disentangle the complicated nomenclature of the species. A new, detailed description of P. neesii with illustrations is provided after comparison of sequenced specimens with the type material. Furthermore, the new combination Pseudographis rufonigra (basionym Peziza rufonigra) is made for a fungus previously known as Pseudographis pinicola.

Biostratigraphy of the Cypress Hills Formation (Eocene to Miocene), Saskatchewan: equid types (Mammalia: Perissodactyla) and associated faunal assemblages

1993 ◽  
Vol 67 (4) ◽  
pp. 660-669 ◽  
Author(s):  
John E. Storer ◽  
Harold N. Bryant
Keyword(s):  
North America ◽  
New Combination ◽  
Western North America ◽  
Local Fauna ◽  
Faunal Assemblages

Among the equid species named from the Cypress Hills Formation (Eocene to Miocene) of Saskatchewan, Mesohippus westoni and M. propinquus are documented from the early Chadronian Calf Creek local fauna, and M. westoni is also known from the earlier Southfork local fauna and from other Chadronian and Orellan deposits of western North America. Teeth possibly referable to Miohippus assiniboiensis are found in association with Whitneyan or early Arikareean assemblages. Miohippus grandis, not M. assiniboiensis, is the correct reference for larger Chadronian equids from Calf Creek and other local faunas. Archaeohippus stenolophus (new combination) is preserved in latest Arikareean or early Hemingfordian beds of the Cypress Hills, and occurs in faunal assemblages that show strong resemblances to the Runningwater assemblage of Nebraska.

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