3. Coprinus spadiceisporus VAN DE BOGART sp . nov .(Fig .3)
Pileus primo ovatus - ellipsoideus , dein campanu - latus , postremo aliquantum revolutus , pimo 3,0-3.8 cm longus , post expansionem 5,0-6.0 cm latus , primo albidus , dein propter sporas maturas atrogriseibrunneus ; apex pallide brunneus , pagina plicato - striata , velo univer - sali tecta ; velum ex squamis parvis appressis constans , sordide albidum aetate laxum et magis dispersum tamen semper aliquantum persistens , carne tenui , membran - acea ; stipes aliquantum crassus ,10.0-12.0 cm longus ,5.0-8.0 mm crassus , cavus , tela hypharum laxarum cap - iens , annulo conspicuo laxo albo coacto ,1.0 mm lato , pagina laevis glabra , basi leviter tomentosa , primo albus , dein apice atranti , carne aliquantum crassa et fibrosa ; lamellae lanceolatae , liberae et remotae , aggregatae , in maturitate brunneolae - atrae , autolysis completa .
Sporae laeves , aliquantum complanatae , ovato - ellip - soideac ,8.1-10.0 x 6.2-6,9 x 5,0-5,6μ m , in cumulo atro brunneae , per microscopium badiae , translucidae , poro germinationis excentrico ; basidia trimorphica , tetraspora ; basidia breviter clavata 12.5-17.5 um longa ,10.0-11.2 um crassa ; basidia longe clavata 20.0-25.0 um longa ,10.0-11.2 um crassa ; basidia ululiformia 28.7-35.0 um longa ,10.0-11.2 um crassa ; cheilocystidia sphaerica vel ellip - soidalia ,15.0 um usque ad 42.5 um longa ,30.0 um crassa , hyphis tenuibus filamentosis mixtis , pagina pilei hypharum radialium ; velum universale superficiei pilei ex catenis cellularum longis parallelis inramosis constan - tium , cellulis interdum tumidis et catenulatis , aliter disjunctis et incohaerentibus , cellulis omnibus laevibus , tenuitunicatis , hyalinis , cellulis contiguis amplitudibus et formis similibus ; fibulae in stipite et velo universali adsunt .
Holotypus FVDB 217 in stercore cuniculo vel cervo detrito mixto , pago Washingtonis occidentalis , in herbario Universitatis Washingtonis conservatus ( WTU ).
PILEUS at first ovate - ellipsoidal , then conical , then campanulate , and eventually somewhat revolute , when unexpanded from 3.0-3.8 cm long , expanding to 5.0 to 6.0 cm wide . Whitish when young but soon grey from ripening spores , the apex pale brownish , soon entirely dark grey - ish brown , except the apex which remains paler brown . Radial pileal striations apparent even at young stage and Soon developing into plicate striations . Surface covered with a universal veil of small somewhat appressed scales of dingy or dirty white color , becoming much looser in age and more scattered but even then more or less persistent . lesh rather thin and membranous . Leaves and debris stuck to pileal surface .
STIPE hollow , rather stout for Coprinus ,10.0-12.0 cm x 5.0-8.0 mm , Prominent , loose , white , felty annu - lus present , about 1 mm in width . Hollow center filled with a weblike mass of loose hyphae . Outer surface smooth and glabrous except for a loose tomentum of woolly hairs at the base . White in color at first but soon darken - ing to light brownish over most of its length and becoming dark , almost black near the apex , opaque , Flesh rather thick and fibrous for a Coprinus .
LAMELLAE lanceolate ,2.5 to 4.0 mm broad , free and remote , crowded , dark brownish black when mature . Autolysis complete .
SPORES ovate - ellipsoidal , slightly flattened , basal end broader than apical end ,8.1-10.0 x 6.2-6.9x5.0-5.6μ m , apiculus and germ pore both prominent , germ pore eccentric ,1,5-2.0 μm in diameter , Color dark blackish brown en masse and a clear translucent chestnut brown microscopically in 3% KOH , Wall smooth .
SIDIA trimorphic , short clavate and 12.5-17.5 x 10.0-11,2 um , long clavate and 20.0-25.0 x 10,0-11,2μ m , ululiform and 28.7-35.0 x 10.0-11.2μ m , all four - spored .
CYSTIDIA : Cheilocystidia globose to more or less ovate ,15.0 um in diameter to 42.5 x 30.0 um , inter - mixed with thin filamentous hyphae on gill edge . No other cystidia present .
PILEAL SURFACE a cutis of radially oriented hyphae .
UNIVERSAL VEIL scales composed of fibrils aligned parallel to each other and composed of chains of unbranched , often swollen cells 6.2-20.0 um in diameter , often constricted at the septations and then catenulate , also tending to break up into single loose cells . All cells of the universal veil with smooth , thin , hyaline walls , and all adjacent cells of the universal veil tending to be of similar size and shape .
CLAMP CONNECTIONS present on the hyphae of the stipe surface and occasionally on the universal veil .
HABITAT coprophilous , on rabbit or deer dung .
Observations : This species shares a peculiar feature with two other species of section Coprinus , C . sterquilinus and C , colosseus , namely , the discoloring and eventual blackening of the apical portion of the stipe flesh . The ovate , flattened spores with their clear light brown color seem distinctive .
Material Examined , Washington : HOLOTYPE , FVDB 217*, collector and date unknown .
