12 c Canadian Arctic Expedition, 1913-18 



Clathrospora pentamera (Karst.) Berlese. On Luzula confusa, L. arcuata, 

 Carex nardina, C. stans, Arctagrostis latifoUa, Aira caespitosa var. 

 arciica, Trisetum subspicatum, Poa abbreviata, P. glauca, P. cenisia. 



Clathrospora platyspora Sacc. On Braya purpurascens. 



Pyrenophora coniata (Awd. and Niessl) Sacc. On Potentilla pulchella, 

 Arenaria ciliata, and Oxyria digyna. 



Mycosphaerella ootheca Sacc. On Dryas octopetala and D. integrifolia. 



Mycosphaerella pachyasca (Rostr.) Vgr. On Chamaenerium latifolium, Ran- 

 unculus affinis, Eutrema Edwardsii, Saxifraga Hirculus, and Ranun- 

 culus hyperboreus. 



Mycosphaerella Tassiana (de Not.) Johans. On Juncus biglumis, Erio- 

 phorum Scheuchzeri, E. polystachyum, Elyna Bellardii, Carex membra- 

 nopacta, C. stans, C. ustulata, C. pedata, C. incurva, Arctagrostis lati- 

 foUa, Aira caespitosa var. arctica, Alopecurus alpinus, Catabrosa algida, 

 Trisetum subspicatum, Poa abbreviata, P. cenisia, P. evagans, Glyceria 

 Vahliana, and G. distans. 



In addition, the following were also collected on EUesmere island, viz. : 

 Venturia chlorospora Fr. On Salix arctica. 

 Sphaerulina Pleuropogonis Rostr. On Pleuropogon Sabinei. 

 Stigmatea Ranunculi Fr. On Ranunculus sulphureus, R. Sabinei. 

 Mycosphaerella Taraxaci (Karst.). On Taraxacum hyparcticum. 

 " arthopyrenioides (Awd.). On Papaver radicatum. 



" Cruciferarum (Fr.). On Braya purpurascens and Draba 



subcapitata. 

 " Polygonorum (Cri6). On Polygonum viviparum. 



" pusilla (Awd.). On Aira caespitosa var. arctica, Catabrosa 



algida, Poa glauca, Carex membranopacta. 

 " Luzulae (Cke.). On Luzula arcuata. 



" Wichuriana Schroet. On Eriophorum polystachyum. 



Sporormia intermedia Awd. On excrement of musk-oxen . 

 Pleospora infectoria Fckl. On Catabrosa algida. 

 Leptosphaeria microscopica (Karst.). On Eriophorum polystachyum. 

 " Silenes de Not. On Silene acaulis. 



" epicarecta Cke. On Carex stans. 



Chaetosphaeria byssiseda Rostr. On Potentilla emarginata. 



DOTHIDEACEAE. 



Dothidella sphaerelloides n. sp. 



Stromatibus epiphyllis. Peritheciis vel loculis emergentibus stromatiter 

 junctis, nigris, breviter conicis, ostiolatis. Loculis 50-180 /^. Ascis aparaphy- 

 satis, fusoideis vel clavatis, 40-45 x 8-9 /x. Sporidiis plerumque 8, interdum 6 

 vel 4, hyalinis, distichis vel oblique monostichis, uniseptatis, 13-16 x 3 /i. 



In foliis vivis Saxifragae Hirculi L. 



Stromata epiphyllous, usually one, sometimes two or three on the same 

 leaf. Perithecia or emergent locules stromatically connected, black, shining, 

 30-36 per sq. mm., shortly conical, terminating in obtuse, paler ostiola. Locules 

 50-180 fi in section parallel to the plane of the stroma. Asci aparaphysate or 

 nearly so, fusoid or clavate, 40-45 x 8-9 /i. Sporidia hyaline, sub-biseriate, uni- 

 septate, upper cell rounded at end and larger than the lower cell, the latter conic- 

 truncate to sub-acute, 13-16 fj in length and 3 ^i in width at the septum. The 

 number of sporidia in the ascus is usually 8 but sometime 6 or even 4. 



On living leaves of Saxifraga Hirculus L. Bernard harbour, Aug. 7, 1915, 

 91430. 



Dr. Anderson found this again on the 15th of August 1915, at Cape Barrow 

 on the same host, 91432. 



