Rev. M. J. Berkeley and Mr. C. E. Broome on British Fungi. 381 



941. Coryneum macrospermum, n. sp. Stroniate niinuto pul- 

 vinato ; floccis sursuin furcatis ; sporis subcylindricis 4-5-sep- 

 tatis, articulis extremis hyalinis. 



Didymosporium macrosperinum, Corda^ Fasc. 6. f. 17. 



On elm-poles. Batheaston, Jan. 1852. 



Forming little scattered sj)ots on the surface of the wood. 

 Stroma cellular; thread cylindrical, equal, forked above. 



This is clearly the plant of Corda, though more highly deve- 

 loped. 



Plate XV. fig. 12. Plant, nat. size; a, the same, slightly magnified; 

 h, vertical slice, showing spores and sporophores; c. the same, showing 

 the branching of the sporophores ; d. mycelium ; e. spores. (All more or 

 less magnified.) 



942. Septonema irregular e, n. sp. Effusum, tenue, nigrum, 

 irregulare ; sporis oblongis. 



On living apple-twigs. Apethorpe, Northamptonshire. 



Forming a very thin, cloud-like, black stratum ; very irregular, 

 sometimes exhibiting continuous threads under the microscope, 

 sometimes distinct spores "OOOZ-'OOl inch long. 



Plate XV. fig. 1.3. Spores magnified. 



943. Arthrohotrxjum stilboideum, Cesati in Hedwigia, tab. 4. 

 fig. 1. On a pollard willow. Langridge, Som., April 1859. 

 Spores '0005 inch long. 



^Monotospora megalospora, B. & Br. no. 759. A form has 

 occurred, on an old stump, with broadly fusiform spores '0012 

 inch in diameter. We do not consider this distinct, because other 

 spores occur which are precisely of the same form as those we 

 have figured in the place indicated above. 



944. Helminthosporium oosponim,Covdii,Yasc. l.f. 200. On 

 sticks. East Bergholt, llev. C. D. Badham, Feb. 2, 1852. 



945. H. apiculatum, Corda, Fasc. l.f. 191. On dead wood. 

 Twycross, Rev. A. Bloxam. 



946. H. dendroideum, n. sp. Floccis erectis sursum attenuatis 

 artieulatis, ramulis brevibus, sporis apicalibus oblongo-subfusi- 

 formibus multiarticulatis. 



On maple. Batheaston, C. E. Broome, Feb. 12, 1857. Also 

 in South Carolina. 



Threads attenuated upwards, articulated; each joint above 

 giving off one or two short branchlets terminated by an oblong, 

 subfusiform, slightly curved, multiarticulate spore "0024 inch 

 long, each joint containing a globose nucleus. 



Distinct from all other species except H. arhuscula, Berk. & 

 Curt., which differs in the peculiar branchlets and shorter spores. 

 The characters of H. arbuscula arc as follows : — 



Floccis erectis suba;qualibus sursum ramulosis ; ramulis bie- 

 vibus lagenseformibus inarticulatis ; sporis fusiforniibus. 



