First report of naturalization of Houttuynia cordata Thunb. 1783 (Saururaceae) in Italy

The Chameleon plant (Houttuynia cordata Thunb.-Saururaceae) was introduced across all continents from Asia for ornamental and medicinal purposes at least two centuries ago. H. cordata is deemed a strong invader thanks to its great ability for rapid vegetative propagation by means of rhizomes and stolons (and their fragments) coupled with a high resistance to herbicides. Moreover, it has been suggested that H. cordata has the potential to displace native plants in wet forests and, in general, in wetland ecosystems. In New Zealand and North America, this species has been included in the black list of invasive alien species and it is included in a special control program for monitoring and eradication. In this study we record the first established naturalized population of Houttuynia cordata in Italy. It was found in July 2019 in a riverine Salix woodland. After revisiting the location, a significant expansion of the initial population was observed in June 2020, suggesting its naturalization with great invasive potential. Criteria and procedures defined by the regional intervention priorities on alien species were applied in order to further monitor and eradicate the species, as an example of good practice for the management of alien species

Using illusions to understand hallucinations: differences in perceptual performances on illusory figures may underscore specific visuoperceptual impairments in Parkinson’s disease

Visual hallucinations are prevalent, potentially disabling symptoms of Parkinson’s Disease. Multiple impairments in bottom-up sensory processing and top-down perceptual modulation are implicated in the pathophysiology of these phenomena. In healthy individuals, visual illusions are elicited by illusory figures through parametric manipulations of geometrical configurations, contrast, color, or spatial relationships between stimuli. These illusory percepts provide insight on the physiologic processes subserving conscious and unconscious perception. In this exploratory, cross-sectional, controlled study, perceptual performance on illusory figures was assessed on 11 PD patients with hallucinations, 10 non-hallucinating PD patients, and 10 age-matched healthy individuals. In order to characterize potential neural substrates of perceptual performances, patients’ brain metabolic patterns on FDG PET were also analyzed. Illusions relying on attentional modulation and global perception were attenuated in PD patients without hallucinations. This pattern was no longer recognizable in hallucinating patients. Conversely, illusory effects normally counteracted by figure to background segregation and overlapping figures recognition were enhanced in PD patients with hallucinations. FDG PET findings further suggest that perceptual differences between PD patients might be linked to abnormal top-down perceptual modulation

Notulae to the Italian alien vascular flora: 10

In this contribution, new data concerning the distribution of vascular flora alien to Italy are presented. It includes new records, confirmations, exclusions, and status changes for Italy or for Italian administrative regions. Nomenclatural and distribution updates published elsewhere are provided as Suppl. material 1

Notulae to the Italian alien vascular flora: 10

In this contribution, new data concerning the distribution of vascular flora alien to Italy are presented. It includes new records, confirmations, exclusions, and status changes for Italy or for Italian administrative regions. Nomenclatural and distribution updates published elsewhere are provided as Suppl. material 1