HELMINTHOSTACHYS. [ 385 ] 



HEMP. 



(1849); Currey, Qu. Mic. Jn.v. 115 j Tulasne, 

 Ann. Sc. Nat. 4 ser. v. 109. 



HELMINTHOS'TACHYS, Kaulf. A 

 genus of Ophioglossaceous Ferns, distin- 

 guished by the complex spikes bearing 

 crested sporanges. 



Fig. 314. 



Fig. 315. 



Helminthostachys zeylanica. 



Fig. 314. Fragment of a spike with, sporanges. 

 nified 10 diams. 



Mag- 



Fig. 315. A portion still more magnified (20 diams.). 



HELVEL'LA, L. The typical genus of 

 Helvellacei. 



Several species occur in this country, 

 amongst which H. lacunosa and H. erispa 

 are esculent. 



BIBL. Fr. Syst. Myc. vol. ii. 13 ; Berk. 

 Outl. 358 ; Hooker, Syn. 447. 



HELVELLA CEI.^-A family of Asco- 

 mycetous Fungi, comprised in Discomycetes, 

 approaching the Hymenomycetes in outward 

 form, but distinguished at once by their 

 fructification. See ASCOMYCETES, HEL- 

 VELLA, SPATHULARIA, LEOTIUM, STICTEI, 

 PROPOLIS. 



HEMELYT'RA. The anterior pair of 

 wings of the Heteropterous division of the 

 Hemiptera. See INSECTS. 



HEMERO'BIUS, [Linn. A genus of 

 Neuropterous Insects. 



Hemerobius (Chrysopa) perla, one of the 

 lace-winged flies, has very thin, transparent, 

 and beautifully netted iridescent wings, in 

 which the circulation can be well observed ; 

 the wings also exhibit well the tracheae in 

 the veins. The larva feeds upon Aphides. 



BIBL. Westwood, Intr. ; Bowerbank, 

 Entom. Mag. iv. 



HEMIAU'LUS, Ehr. A genus of Dia- 

 tomaceae. 



Char. Frustules single, compressed, sub- 

 quadrate, with two tubular processes on each 

 side, the ends of those (the shorter) on one 



side being open, the others closed ; not con- 

 stricted at the sides. 



H. antarcticus (PI. 25. fig. 3). 



BIBL. Ehrenberg, Berl Ber. 1844, 199 ; 

 Greville, Ann. N. H. xvi. 5 j id. Mic. Tr. 

 1865, 26, 52, 101. 



HEMIDIN'IUM, Stein. A genus of 

 Cilio-flagellate Infusoria: free, flagellum 

 single ; a fringe of cilia in a groove exten- 

 ding halfway round the body. H. na- 

 sutum. yellow; freshwater. (Kent, Infus. 

 442.) 



HEMIDIS'CUS, Wall. A genus of 

 Diatomacege. 



Char. Fr. free; valves arcuate, with a 

 median marginal inferior nodule ; areolation 

 hexagonal, radiate. 



H. cuneiformis. From Salpce, Bay of 

 Bengal and Indian Ocean. 



BIBL. Wallich, Mic. Tr. 1860, viii. 42 



HEMILEI'A, Berk. A genus of Ure- 

 dinese (Hynodermous Fungi), characterized 

 by the meniscoid spores, which are smooth 

 within, but strongly granulated without. H. 

 vastatrix, the Coffee-fungus, is extremely 

 destructive to the Coffee-plants, forming 

 orange-brown spots upon the leaves. One or 

 two other Rubiacese are attacked by a 

 distinct species. In germination, a form of 

 Penicillium has often been developed, but 

 this is probably accidental. 



BIBL. Berk. & Br., Jn. Linn. Soc. xiv. 93 ; 

 Dyer, Qu. Mic. Jn. 1880, xx. 119 (figs.) ; 

 Abbay, Jn. Linn. Soc. xvii. 176; Ward, 

 Mic. Jn. xxii. (figs.). 



HEMIONI'TIS, Linn. A genus of 

 Grammitideae (Polypodiaceous Ferns), with 

 a very elegant reticulated arrangement of 

 the sori. 



Eight species ; exotic. (Hooker, Syn. Fil. 

 398.) 



HEMIOPH'RYA. A genus of Acine- 

 tina (Kent, Inf.}. 



HEMIP'TfiRA. An order of INSECTS. 



HEMIP'TYCHUS, Ehr. See ABACH- 



NOIDISCUS. 



HEMITE'LIA, Presl A genus of Cya- 

 thseous Ferns. Exotic. (Hook. Syn. 27.) 



HEMIZOS'TER, Ehr. (Ehrenberg, Ber. 

 Berl. Ak. 1844, 199). 



HEMP. The orclinary name of the fibre 

 of Cannabis sativa, consisting of the liber- 

 fibres of this plant (PI. 28. fig. 6). It is 

 applied to some other substances used for 

 the same purposes, e. g. Manilla hemp (the 

 fibre of MTJSA) &c. See TEXTILE FIBRES 

 and LIBER. 



2c 



