Three New British Coprini. A. H. R. Buller. 363 



THREE NEW BRITISH COPRINI. 



By Professor A.H.R. Buller, D.Sc, Ph.D., F.R.S.C. 



I. Copriiiiis cchinosponis Buller, sp. n. 



Pileiis 15-18 mm. high before expansion, white, then grey, 

 and finally dirty yellowish-brown, oval, then conico-campanu- 

 late, becoming flattened, about 3 cm. broad, and finally revo- 

 lute and radially splitting along the lines of the longest gills, at 

 first clothed with short dense clown which then breaks up into 

 small, delicate, thin, fugacious tufts or scales consisting of slen- 

 der branched cells, 80-150 x 5-iO)u,. Stipe 9 cm. x 3 mm. at 

 base, white, slightly attenuated upwards, straight or flexuose, 

 firm, adpressedly hairy. Gills blackish at maturity, adnexed, 

 very thin, V'cry slightly wedge-shaped, autodigesting on the 

 edges. Flesh brownish-yellow, brownish at the apex of the 

 pileus, becoming finally dirty ochraceous. Spores black in the 

 mass, very dark and opaque under the microscope, finely warted 

 or echinulate, oval, more or less pip-shaped, truncate at the 

 apex, 9-1 1 X 5-7/u., with an apical germ-pore through which a 

 transparent membrane often protrudes; basidia of three lengths, 

 surrounded by 3-4 paraphyses. Cystidia abundant, rounded at 

 both ends, generally parallel-sided, rarely globose, 70-95 x 23- 

 30/z, varying up to 105^11 in length and 45-57/M in diameter. 

 Habitat, on sticks dredged from a pool at Kew, October, 191 1. 



The most striking character of this species lies in the coarsely 

 verrucose spores which are truncate at the apex; but, in general 

 aspect, it resembles Copriiius lagopiis Fr. (= C. fimctarins and 

 C. cinereus of authors). 



Pileo 15-18 mm. alto, ovali, albo-cinerascente, dein 3 cm. lato, 

 conico-campanulato, sordide fusco-lutescente, postea revoluto 

 radiatimque fisso, farina tcnui cOnsperso. Stipite albo, sursum 

 attenuato, firmo, adpresse pubescente. Lamellis adnexis, atris; 

 sporis amygdaliformibus, verruculosis vel echinulatis, apice 

 truncatis, 9-1 1 x ^-yyi\ cystidiis copiosis, ellipticis. 



2. Coprinus hisporus Lange. 



Lange, Studies in the Agarics of Denmark, pt. 11, Coprinus, 

 Dansk Bot. Ark., bind 2, no. 3, p. 50. Synonym: Coprinus 

 bisporiger Buller in Trans. Brit. Myc. Soc, 1911, p. 350. 



