-67- 



Scapama tindnlata, Porella pinnata, Fontinalis dalecarlica, F. gigantea, F. Les- 

 curii, Oxyrrhynchium rusciforme, Amblystegium fluviatile, A. irriguum, Hygro- 

 hypnum dilatatum, H. eugyrium, and H. ochraceum. 



(b) On periodically inundated rock surfaces: Fissidens incurvus^ Grimmia 

 apocarpa, Racomitrium aciculare, and Brachythecium plumosum. 



(c) Along with but usually on springy banks, or on continuously moist 

 rock surfaces, where they may or may not be submerged during floods: Cono- 

 cephalum conicum, Pellia epiphylla, Plagiochila asplenioides, Lophocolea hidentata^ 

 Juhula pennsylvanica, Anthoceros laevis, Fissidens adiantoides, Mnium hornum, 

 M. punctatum, Philonotis Jontana, Thuidium delicatulum, Brachythecium rivulare, 

 Climacium americanum, and Catharinaea undulata. 



{d) Wet or moist overhanging cliffs and precipitous cliffs higher up: Mar- 

 supella emarginata, Plagiochila asplenioides, Scapania nemorosa, Radula com- 

 planata, Lejeunea cavijolia, Hymenostylium curvirostre, Didymodon rubellus, 

 Anoectangium Mougeotii, Plagiopus Oederi, Plagiothecium denticulatum, Hylo- 

 comium brevirostre, aid Thamnium allegheniense. 



(g) On crevices or rock faces of drier cliffs: Metzgeria conjugata, Cephalozi- 

 ella Hampeana, Porella platyphylloidea, Lencolejeunea clypeata, Frullania Asa- 

 grayana, Rhabdoweisia denticulata, Grimmia conferta, Ulota americana, Bartramia 

 pomiformis, Eedwigia albicans^ Neckera pennata, Haplohymenium triste, Anomodon 

 attenuatus, and A. rostratus. 



Nichols notes that "Owing to their frequently intimate association with 

 rock surfaces, no group of plants, with the possible exception of the lichens, is 

 better qualified to demonstrate the influence of the chemical composition of the 

 substratum on vejetation than the bryophytes." He notes that in Connecticut 

 this influence is largely that of calcareous as against potassic rocks and gives in 

 that connection the following lists: 



Species favoring calcareous rocks (mostly on marble, some on trap): Grim- 

 aldia fragrans, Preissia quadrata, Pellia Fabroniana, Lophozia badensis, Lophocolea, 

 minor, Cololejeunea Biddlecomiae, Frullania riparia, Saelania glaucescens, Fissi- 

 dcjis cristatus, Cratoneuron filicinum, Hymenostylium curvirostre, Tortella tortuosa, 

 Encalypta contorta, Mnium orthorrhynchum, Plagiopus Oederi, Myurella julacea, 

 Amblystegiella conjervoides, and Amblystegium noterophilum. 



Mostly restricted to potassic rocks (i. e. "lime-avoiding"): Marsupella 

 emarginata, Sphenolobus exsectus, Scapania nemorosa, S. undulata, Radula obconica, 

 Andreaea petrophila, A. Rothii, Rhabdoweisia denticulata, Dicranum fulvum, 

 Glyphomitrium incurvum, Racomitrium aciculare, Ulota americana, Pterigynan- 

 drum filiforme, Brachythecium plumosum, Sematophyllum carohnianum, Hygro- 

 hypnum dilatatum, and H. eugyrium. 



Farther on in the article Nichols discusses the boreal aspect of the vegeta- 

 tion in rock ravines, noting that locally rare Canadian plants such as Lophozia 

 alpestris, L. attenuata, Gymnostomum rupestre, and Polytrichum alpinum have 

 been collected only in rock ravines. Further he notes that of the bryophytic 

 flora in the forests of these ravines "the mossy carpet of Bazzania trilobata, 

 Hylocomium splendens, Pttlium Crista-castrensis, and Hypnum Schreberi which 

 frequently covers the forest floor — likewise is strongly suggestive of the north," 



