Anatomical and macroscopic features of the bark are described for the Cupressaceae indigenous to southern South America: Austrocedrus chilensis, Fitzroya cupressoides and Pilgerodendron uviferum. Macroscopically there are two different types: 1) with rather deep longitudinal and transverse fissures, and short ridges or scales varying in adherence (Austrocedrus); and 2) with deep fissures, and elongate and wide ridges, which contain the rhytidome accumulated over several years (Fitzroya and Pilgerodendron). The pattern of the secondary phloem of the three species studied agrees closely with that of the other genera of Cupressaceae, but there are diagnostic differences as well: arrangement of the fibre rows, fibre types, frequency of resin ducts and the ray height. Pilgerodendron uviferum shows rays with erect marginal cells, similar to Strasburger cells, whereas ray sclereids in the fibre crossing zones were only observed in Austrocedrus. Resin ducts are present in Austrocedrus and Fitzroya. The main characteristics are used for an identification key. Anatomical relations with other genera of the family are discussed.

The bark structure of Nothofagus alpina (Poepp. et Endl.) Oerst., N. antarctica (G.Forster) Oerst. N. obliqua (Mirbel) Oerst., N. pumilio (Poepp. et Endl.) Krasser, N. betuloides (Mirbel) Oerst. and N. dombeyi (Mirbel) Oerst, native species from the Andean–Patagonian forests (Argentina), is described. Barks of the Nothofagus species are greyish to dark brown and have deep fissures, except that of N. obliqua. Non-collapsed secondary phloem has abundant sieve elements with scalariform compound sieve plates in oblique end walls, and with rounded to polygonal sieve areas in tangential walls. Axial parenchyma in secondary phloem is diffuse and/or arranged in discontinuous uni–triseriate tangential lines and bands. Crystalliferous axial parenchyma is present adjacent to sclerenchyma. Rays are usually homocellular, exclusively uniseriate in N. dombeyi to bi–triseriate in the other species. Fibres in secondary phloem are arranged in clusters, tangential lines and bands. Combined fibre and sclereid clusters are present in N. betuloides. Persistent rhytidomes usually include a variable proportion of bark. The present study helps to confirm the taxonomic placement of Nothofagaceae as a distinct family from Fagaceae, and supports the infrageneric classification of Nothofagus proposed by different authors.

Cone serotiny refers to canopy seed storage in cones that remain alive, though closed, for several years. There are some Cupressus species which have only serotinous cones, or both serotinous and non-serotinous cones on the same tree. Scale separation and seed release occurs immediately after the cone ripens in nonserotinous cones, or else the cones remain closed and alive longer, generally up to 15-20 years. Germination tests were done with serotinous cone seeds from C. arizonica Greene, C. benthamii Endl., C. lusitanica Mill., and C. macrocarpa Hartw. Germination was below 50% for all species. The highest levels of germination were obtained from 2-to 7-year-old cones, depending on the species. Cupressus arizonica showed a regular decline in germination values, from 43.5% for seeds from 3-year-old cones to 7.5% for seeds from 7-year-old cones. Cupressus benthamii had a maximum germination value of seeds from 5-year-old cones. Cupressus macrocarpa had a maximum germination capacity of 20.5% for seeds from 6-year-old cones, and it showed 7.5% germination for 12-year-old seeds. Cupressus lusitanica reached 33.5% germination of seeds from 5-year-old cones. Serotinous cones from Cupressus species, usually not collected because it is assumed that their seeds are not viable, can be utilized in cone harvesting, increasing the yield of the cone-bearing trees.

Se cita por primera vez para la Argentina a la especie Holcocranum saturejae (Kolenati) (Hemiptera: Heteroptera: Artheneidae), que se alimenta principalmente de totoras (Typha spp., Typhaceae) y, en menor medida de otras plantas, en base a una muestra proveniente de la Reserva Natural Provincial Santa Catalina en Lomas de Zamora, provincia de Buenos Aires. Se muestran imágenes de ejemplares recolectados y se dan sus caracteres diagnósticos. Se comenta brevemente la importancia de la aparición de esta especie en la Región Neotropical.

Se describe una nueva especie, la segunda del género Mazanoma Rolston y Kumar, uno de aquellos géneros patagónicos de Acanthosomatidae que se distribuyen por fuera del Bosque Subantártico. Se discute su taxonomía e importancia en el estudio de la biogeografía de la familia. Se describe el ambiente en el que fue hallada, hipotetizándose además sobre su planta hospedante.