Pennsylvania Natural Heritage Program informationinformation forfor thethe conservationconservation ofof biodiversitybiodiversity WILD HERITAGE NEWS Summer 2018 Tough Nuts to Crack Inside This Issue Zeroing in on Some of Our Most Mysterious Plant Species by Tough Nuts to Crack 1 Jessica McPherson Emerging Invasive 6 Scientific understanding of our native Cleveland Museum of Natural History. Plant Threats biodiversity is a constant work in progress. The stories of some of these species EYE Con Summer 8 We continue to uncover the intricacies of illustrate the interesting complexities of Camp our native plant species habitat our native diversity, some trends in Spotted Turtle 8 requirements, biological needs, and conservation, and some of the data gaps Conservation ecological interrelationships such as animal that often challenge our ability to assess State Park Vernal Pool 9 pollinators and seed dispersers. To the conservation needs of plant species. Surveys determine the conservation needs of our native species, the Natural Heritage Netted Chain Fern New Cooperative Weed 9 Program synthesizes the best available The netted chain fern (Woodwardia Management Area science on what we know a species needs areolata) was previously known almost Tick Borne Disease 10 to survive with population data and information exclusively from the coastal plain in Collaboration on any threats it faces. For plants, the Pennsylvania, but new field work suggests Indian Creek Caverns 11 sheer numbers of species pose a significant challenge; there are over 2,100 native Rare Plant Finds at 11 Bear Run Nature plant species in Pennsylvania, and about Reserve 800 species are of conservation concern. Mudpuppy Project 12 The Plant Status Update Project Spring Insect Survey 13 completed in 2016, was a focused Photo Highlights investigation of 56 plant species that DCNR determined lacked sufficient data to evaluate the appropriate conservation Photo Banner: status. Along with PNHP botanists, Netted chain fern botanical experts from institutions across (Woodwardia areolata) the state contributed to the project, © Arthur Haines Haines © Arthur Society Wildflower England New including the Morris Arboretum, the Jessica McPherson Meadow rose (Rosa blanda) - native or not? This Carnegie Museum of Natural History, and plant remains a mystery. Wild Heritage News 2 of many historical collections but almost no recent collections. Furthermore, when we inquired among expert botanists in the state, many of whom had been working in Pennsylvania for decades, only a few of them had ever seen it. However, to support assigning a legal conservation status to a species that once appeared to be relatively common, we needed to do some focused surveys to make sure it wasn’t still out there, and some digging in scientific literature to understand any possible reasons for this apparent dramatic decline. Our surveys, PNHP records of netted chain fern (Woodwardia areolata). Historic unfortunately, did not records (blue dots) are concentrated in southeastern Pennsylvania. find much. We now Extant records (green dots) may represent population expansion in know of about 16 the central part of the state. plants in eleven it appears to be expanding west and north. Several locations across the populations have been found outside of the coastal state. Half of these are plain, and since some of them are in places that have just a single seedling at been fairly well surveyed in the past, our biologists a site. Our literature believe they are newly established populations. We’re review, however, found not sure why it is expanding, but it could be related to that similar declines changes in climate as Pennsylvania is at the northern have been observed in edge of this species’ range. Because new data reflect a many parts of its fairly Jessica McPherson Jessica larger number of populations and an expanding range, wide geographic range. Leaves and trunk of a young red we updated the recommended status for this species Studies have shown mulberry tree from Pennsylvania Threatened to Pennsylvania Rare. that the red mulberry and the non-native white mulberry (Morus alba) Red Mulberry hybridize, and the red mulberry loses out. Not only The red mulberry (Morus rubra) was first proposed as does the red mulberry lose its distinctness as a species, Pennsylvania Threatened in 2013, and it was a very its reproduction is inhibited by the hybrids, and its unusual proposal, because we have over a hundred genes are underrepresented in these white–red crosses. historical records of this White mulberry is widespread in eastern Pennsylvania, tree spread so hybridization could be an important reason for the across the decline of the red mulberry there. However, we southern half of suspect that there may be other factors at play as well, the state. It because even in remote areas where white mulberries came to our have not escaped, our searches for the red mulberry attention when have been largely unsuccessful. Many literature reports someone have referenced decline due to disease, although there investigated is not clarity or agreement on exactly what disease which species agent is responsible. have had a decline in The remarkable – and cautionary – element of this museum story is that a native tree species seems to have all but collections in vanished from the state over several decades without recent years. anyone really noticing, and we still don’t have enough For the red data to effectively combat the threats that have caused Jessica McPherson Jessica mulberry, there its decline. However, we have taken the first steps in Leaves of a red mulberry which tend to be was a very recognizing these threats and recommended a heart-shaped and unlobed when growing in shaded conditions, striking pattern conservation status of Pennsylvania Threatened. Wild Heritage News 3 White Trout Lily The white trout lily (Erythronium albidum) did not have a status recommended at the start of the project. We knew it was less common than the yellow trout lily (Erythronium americanum), but we weren’t sure how much was out there. We had a vague understanding of its habitat and little sense of what threats it might be facing. This species had long been overlooked because it blooms very early in spring, the flowering window is short, and it can’t be distinguished from the yellow trout lily by leaves alone. We mapped out the dates for all past observations of the species and identified a two- Robert Coxe Robert week survey window, approximately April 15 to May 1. Tall meadow rue (Thalictrum pubescens) - upright stamens One of our partner botanists, Loree Speedy, also found a way to extend the survey window a few weeks past flowering by distinguishing subtle characteristics of the fruit shape. With this information, several partners did fieldwork in different parts of the state and found several new populations, refining their understanding of white trout lily habitat. It likes higher pH soils, which are uncommon in Pennsylvania, and often lives on rich floodplains. With a total of 42 populations documented (a relatively high number), evaluation of the threats facing this species was important to assessing the appropriate status. R.W. Smith Smith R.W. Center Wildflower Bird Johnson Lady Purple meadow rue (Thalictrum dasycarpum) - drooping stamens PNHP now uses a tool created by NatureServe called the Rank Calculator, which provides a systematic way Tall Meadow Rue to evaluate threats. In this case, there is no single major Tall meadow rue (Thalictrum pubescens) is a common threat causing dramatic decline in white trout lily, so we plant of Pennsylvania wetlands and is distributed were somewhat surprised to find that this species could throughout the state, with a global range concentrated be facing a “death from a thousand cuts” in which it in northeastern North America. However, it has a could lose a significant proportion of currently known cousin, the purple meadow rue (Thalictrum dasycarpum) populations over the next several decades. For with a similar geographic range, concentrated in the example, adding together a projected 3% decline from Midwest with a string of outlier populations in Ohio at 15 different threats (i.e., residential development, the eastern edge of its range. Several plant specimens had been collected in northeastern Pennsylvania and labelled as the purple meadow rue, so this species had been recommended as Pennsylvania Endangered. However, as is often the case with closely related species that have adjacent geographic ranges, the shared edge of their ranges is a zone where identification can get a little bit tricky, due to past or present hybridization. Our botanists reviewed the herbarium specimens and determined that all except one of them were actually the tall meadow rue. We visited the site of the single purple meadow rue specimen but were unable to relocate the plants. Therefore, we now recommend that this species be considered John Ambler Ambler John Preserve Wildflower Ferry Shenk’s Pennsylvania Historic. White trout lily growing in a rich floodplain Wild Heritage News 4 outdoor recreation, invasive species, timbering, they were all extreme flooding, etc.), results in a total projected recorded from decline of 45%. Without the systematic approach of the major river rank calculator tool, the high threat level faced by the shores, which white trout lily may not have been apparent. provide a similar Considering the new information on population kind of habitat numbers, somewhat limited available habitat in to