sixteen isolates of colletotrichum were collected from leaves with anthracnose symptoms or leaf spots of twelve wild, cultivated and ornamental plant species from the guilan, mazandaran, and golestan provinces in northern iran. five different species, including c. aenigma, c. gigasporum, c. godetiae, c. karstii, and c. musae were identified based on the dna sequence data (tub2, gs, gapdh). four...

Over the last three decades, the philosophy of Karl Raimund Popper has had a strong influence on the field of systematic biology. Unequivocally, no other philosopher's work has had such an influence during this formative period in systematics. Much, but not all, of the early discourse on Popper and systematics dealt with the philosophical basis of systematics as a science. More recently Popper'...

The major contributions of John N. Belkin to the field of mosquito systematics are noted. Hallmarks of his publications are presented and his hypotheses about the evolution, speciation, competition, distribution and classification of mosquitoes are summarized. The current status of the field of mosquito systematics is examined. It is argued that mosquito systematics is still largely at the alph...

In the historical context of plant systematics over the last 50 years, systematics is examined in terms of where it is now, where it is headed, where it should be, and how it should get there. Issues and concerns of the past decades are still with us today. Molecular systematics has become the over-arching field in systematics, but each of eight other areas (genome, chromosomes, morphology and ...

Spatially varying depth and the characteristics of observing conditions, such as seeing, airmass, or sky background, are major sources of systematic uncertainties in modern galaxy survey analyses, particularly in deep multi-epoch The Astrophysical Journal Supplement Series, 226:24 (13pp), 2016 October doi:10.3847/0067-0049/226/2/24 © 2016. The American Astronomical Society. All rights reserved....

In as much as our paper (de Queiroz and Donoghue, 1988) was intended to be a contribution to, rather than a criticism of, phylogenetic systematics, it seems odd that Nelson (1989: 277) views our efforts as being "potentially destructive to the independence of cladistics". On closer inspection, however, Nelson's reaction is understandable as a manifestation of fundamental differences between wha...

In his commentary on the state of systematics today, Crisci (2006) adds his perspectives to a series of such commentaries published in the pages of Systematic Botany (e.g., Kruckeberg 1997; Lammers 1999; Landrum 2001). He associates the rise of molecular biology with the decline in conventional plant taxonomy and makes a number of assertions about cause and effect in systematics in particular a...