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The Ash-breasted Tit-tyrant, Anairetes alpinus (Carriker, 1933) (Aves, Tyrannidae), is an endangered and highly specialized bird that inhabits the Polylepis forests (Rosaceae) of Peru and Bolivia. Here, we report 2 new localities in the department of Junín, central Peru, where it was detected in forests dominated by Polylepis canoi, P. rodolfo-vasquezii, and a third undescribed Polylepis species. We conclude that a residential population is the more likely possibility although the possibility of dispersal individuals should also be considered.

A�������. Polylepis (Rosaceae) is the dominant tree genus in High-Andean forest ecosystems. These ecosystems are severely threatened, but li�le is known about their structure and functioning. We provide the first reports of the dasometric structure and spatial distribution of eight forests of Polylepis canoi, P. flavipila and P. rodolfovasquezii in the Central Peruvian Andes as fundamental information for management and conservation policies. We sampled all individuals ≥1 cm of diameter at ground level (DGL) in 20 plots of 10x10 m in each forest, and measured total height (TH) and DGL. Also, we mapped the spatial distribution of the individuals in two plots of 30x30 m (X and Y axes). We found differences in the dasometric structure between forests of the same species, which, in some cases, were associated with climate, soil or elevation variables. However, no well-defined pa�ern was found. The allometric relationships of the linear and non-linear models did not differ widely with respect to the R 2 nor to the Akaike (AIC) scores, indicating that the forests did not show a saturation of tree height with increasing diameter. In the P. canoi forests, individuals with diameters ≥10 cm were the most abundant. In contrast, the forests of P. rodolfo-vasquezii showed a predominance of individuals with diameters ≤10 cm, whereas P. flavipila presented an altered structure with no relationship between DGL and TH in one of the evaluated forests. The analysis of spatial distribution according to the Ripley's K function on a small scale revealed that P. flavipila and P. canoi presented random pa�erns, whereas P. rodolfo-vasquezii showed an aggregate pa�ern. Finally, our results showed that even forests of the same species have different dasometric structures, whereas spatial pa�erns differ only between species. So, caution must be taken when extrapolating information between species or forests during ecological studies and conservation actions.

A new species of Epidendrum from Peru, Epidendrum curimarcense, is described, illustrated and compared with the similar species Epidendrum ampelospathum. The new finding represents an important record for the flora associated with Polylepis forests of central Peru. The species has stems produced from a middle internode of the previous cane-like stem, a spathe, an elongate peduncle with several similar spaced bracts, flowers opening in succession, petals narrower than the sepals, a 3-lobed lip which is bicallose with rounded sub-equal lobes, and 4 obovoid, laterally compressed pollinia. Key Words / Palabras clave: Andean orchids, central Peru, Epidendrum, Junín, orquídeas andinas, Polylepis