42 THE JOURNAL OP BOTANY 



A small well-marked genus, belonging to the VerrucariacecB, 

 with representatives in North and Central Europe ; now for the 

 first time discovered in Great Britain. 



Gongylia viridis, sp. n. Thallus primum Isete-virescens, 

 tenuis, effusus. Perithecia numerosa, in statu humecto nitido- 

 nigra, globosa, ad basim leviter immersa, ostiolis distinctis amplius 

 dehiscentibus ; tunica externa nigra, mollis, dimidiata, interne 

 nigro-smaragdina ; ascis elongato-clavatis ad basim curvatis, circa 

 0-140 mm. longis, 0-010-12 mm. latis ; paraphysibus longioribus 

 quam ascis, numerosis, filiformibus ; sporis angustate fusiformi- 

 acicularibus, subito sursum angustatis vel apice obtusis, ad basim 

 sensim decrescentibus, 0-060-65 vel -85 mm. longis, 0-002-3 mm. 

 latis. 



Ad terram arenaceam. *■ 



Collected in the early months of 1910 by Mr. B. W. J. Starling 

 on the side of a footpath near Horsley, Surrey, and communicated 

 to me by Mr. A. W. Dennis. It is interesting to note that the 

 same species was gathered last autumn at two different localities 

 in Epping Forest, near Theydon Bois and near Loughton. It is 

 nearly allied to G. sahuletorum, a species recorded from Central 

 Europe, but differs in the thallus and in the much longer spores. 



Microglaena Larbalestierii, sp. n. Thallus tenuis sub- 

 brunneus mucilaginus, vel, in statu sicco, rimosus, rugosus, sparsus. 

 Perithecia in thallo immersa, conica, ostiolis tantum notata, tunica 

 ad basim hyalina, paraphysibus gi-acilibus, numerosis ; ascis mag- 

 nis oblongo-cylindraceis ; sporis octonis, oblongo-fusiformibus, 

 hyalinis, muriformibus, circa 0-050-55 mm. longis, 0-010 mm. latis. 



Ad saxa in llumine. 



Collected by Mr. C. Larbalestier at Twelve Pins, Connemara, 

 Galway. It belongs to this genus by its well-developed paraphyses 

 and by its muriform spores with many transverse septa and one or 

 more longitudinal divisions. It differs from other species by the 

 habitat and structure, and by the large subfusiform spores. 



Microglaena Holliana, sp. n. Thallus effusus, albidus, tenuis 

 vel obsoletus. Perithecia fusca, conica, semi-immersa, in statu 

 humecta laBte-brunnea, sparsa vel interdum conferta, raro due vel 

 plura inter sese cohasrentia ; tunica ad basim hyalina supra laete- 

 brunnea ; paraphysibus gracilibus paucis ; ascis elongato-oblongis ; 

 sporis octonis, magnis, ellipsoideo-fusiformibus, interdum medio 

 leviter constrictis, muriformibus, 0-050-60 mm. longis, 0-015- 

 17 mm. latis, cellulis parvis. 



Ad terram, ad thallum Cladonice, ad muscos, &c. 



Collected by the late H. B. Holl at Dolgelly, Merioneth. The 

 squamules of the Cladonia are dotted with the clear brown 

 conical perithecia. 



Arthopyrenia areniseda, sp. n. Thallus albido-cinereus, 

 continuus, granulosus, leviter furfuraceus. Perithecia minuta, 

 nigra, semi-immersa, subglobosa, Integra, ostiolo lato notata; para- 

 physibus numerosis, gracilibus, ramosis ; ascis elongatis, utrinque 

 angustatis, circa 0-140 mm. longis, 0-025 mm. latis; spoi'is 



