BOTANY 



lichen, made in 1887, showed that it was not an Urceo/aria, but a 

 Lecidea. I pointed out to Dr. Nylander, Paris, that it should be named 

 Lecidea diacapsis, and this decision he confirmed. At Dr. Nylander's 

 request I searched and re-searched carefully what he termed * the 

 classic ground ' of this lichen, but did not succeed in re-finding it. 



Mudd's Manual of British Lichens likewise contains notices of 

 lichens from Teesdale, where he personally did some collecting. 



The following limited list is a selection from my own personal 

 gatherings of lichens in the county of Durham. Each species or 

 variety is either in my herbarium or has passed through my hands : 



Sirosiphon mineatum, Hass. 



Ephebe pubescens, Fr. 



Collema pulposum, var. pulposulum, NyL 



tenax, var. coronatum, Koerb. 



limosum, Ach. 



polycarpon, Schaer. 

 Leptogium biatorinum, Nyl. 

 Sphinctrina turbinata, Pers. 

 Pycnothelia papillaria, Duf. 

 Cladonia pityrea, f. denudata, Johns. 



- Florkeana, f. bacillaris, Ach. 

 Clad ina sylvatica, f. scabrosa, Leight. 



f. tenuis, Lamy. 



uncialis, f. adunca, Ach. 

 Stereocaulon denudatum, Flk. 

 Evernia prunastri, var. stictocera, Ach. 

 Cetraria island ica, L. 



- aculcata, f. acanthella, Ach. 

 Platysma triste, Web. 



Platysma sxpincola, var. ulophylla, Ach. 

 Peltigera aphthosa, L. 



rufescens, Mtlhi. 

 Solorina saccata, Ach. 



spongiosa, Nyl. 



Physcia parietina, f. cinerescens, Leight. 



tenella, Scop. 

 Umbilicaria polyhirza, L. 



Umbilicaria cylindrica, L. 



var. tornata, Fr. fil. 

 Placodium decipiens, Arn. 



sub-sp. P. tegularis, Nyl. 

 Ltcanora sambuci, Pers. 



frustulosa, Dicks. 



Parisiensis, Nyl. 



atrynea, Ach. 



galactina, f. dispersa, Pers. 



sub-sp. L. dissipata, Nyl. 



ochracea, Schaer. 



Hageni, Ach. 



syringea, Ach. 



subcarnea, Ach. 



intricata, Nyl. 



expallens, Ach. 



ventosa, L. 



chalybxa, Schaer. 

 Pertusaria globulifera, Nyl. 

 Lecidea atrorufa, Dicks. 



lucida, Ach. 



parasema, var. rugulosa, Ach. 



plana, Lahtn. 



aroma tica, Sm. 



caeruleonigricans, Lightf. 



alboatra, Hoffm. 

 Endocarpon miniatum, L. 



FRESHWATER ALG^E 



It is much to be regretted that very little attention has been devoted 

 to the study of the freshwater alga? in Durham, as it offers a rich field 

 for investigation to those interested in this branch of botany. The 

 craggy ravines and upland glens of the highlands of Teesdale and Wear- 

 dale, and their rapid streams flowing over rough rocky beds of limestone, 

 sandstone, or basalt, especially, would well repay some exploration. 

 Owing to the variations of altitude and soil there appears to be a great 

 wealth of species and genera. It is only possible, however, to give a 

 very brief survey, chiefly from observations of the writer. 



The Blue-green Algae (Cyanophyceee) are richly represented, the 

 humid atmosphere of the upper dales being especially favourable to such 

 genera as Nostoc, Lyngbya, and Gleocapsa, while the ponds and ditches are 



