10 OTTO V. DARBISH1RK. [SEC. ARCT. EXP. FRA.M 



Lecidea purissima. (Tab. 1. fig. 1). 



Diagnosis: Crusla crassiuscula indistincte areolata, albida vel di- 

 Intis-ime Mavescens, partihus alhidis discontiguis sed hypothallo nigro 

 hnpositi-. liypnlhallo nigro instructa. Apolhecia usque ad 1 mm. lata, 

 primnm immersa et thallo subaequanlia, marginata, nigra, deiiulo quasi 

 elevaia. >nh-e->ilia convexa et immarginata; epithecium nigruni: hypo- 

 thecimn decolor: asci inflato-clavati: paraphyses simplices; sporae octo- 

 nae. hyalinae, 12 .5 mi. 15 mi. longae, 56 mi. latae. Habitat ad saxa. 



Notes: This species is characterised by the smaller or larger 

 white portions of the thallus which are not continuous, but which are 

 superimposed on an hypolhallus of dark colour. Externally it much 

 resembles a specimen of "Lecidea alpicola, WAHL. Port Kennedy, Dr. 

 WALKER 25." in the Herbarium at Kew. But this is really Catocarpnn 

 chionopliilitin, Tn. FR., and its spores are in fact two-celled, black and 

 measure 2236 ) [ 11 18 mi. Our species differs from Lecidea macro- 

 carpet (DC.) TH. FR. by its smaller spores. I think that it is a new spe- 

 cies. But as I mention later on the Lecidcas of the world require re- 

 vi>ing monographic-ally. 



Lecidea, solitaria. (Tab. 1, fig. 2). 



Diagnosis: Crusta tenuissima, fere obsoleta, albida. hypothallo 

 nullo distincto; Apothecia dispersa, ad 1 mm. lata, nigra, margine con- 

 colori cincto, demum immarginata, convexa; epithecium nigrum; hypo- 

 thecium decolor; paraphyses non-articulatae; sporae octonae, non-unise- 

 riatae, subglobosae, 5 X 6.4 mi. magnae. Habitat ad saxa. 



Notes: From the description this plant appears to be not unlike 

 Lecidea ultima, TH. FR.. but in the latter the hypothecium is darker, 

 the paraphyses are articulate and the spores uniseriate. It also in some 

 respects resembles the "crusta fere nulla" - forms of Lrcidra auricn- 

 l<tta. Tn. FR. but the persistent margin of the latter is a distinguishing 

 feature. 



d r i tillaria, sanguinaria . 



Diagnosis: Crusta tennis, cinerascens, minute rimoso-areolata, 

 m.'irgiin- fiiscM-nigricanti. hypothallo albido, fere effigurato, centro rimoso- 

 diffiacla et fen- papillosa. Apothecia iniimta. ad .'.\ mm. lala. papillis 

 iiiiiiier>a. nigra, margine albido cincla, convexa, lecideina; epithecium, 

 parathecium et hypothecium nigrum; sporae octonae, halone nullo, 16 )< 6 

 mi. maunae. bicellulares, hyalinae. Habitat ad saxa. 



