HAPLARTA. 



[ 316 ] 



HELIOPELTA. 



the frond, appearing to the naked eye like 

 red dots. 



BIBL. Harvey, Brit. Mar. Ala. p. 148. 

 pi. 19 D. 



HAPLARIA, Link. See BOTRYTIS gri- 

 sea. 



HAPLOMITRIUM, Nees. A genus of 

 Jungermannieae (leafy Hepaticacese), contain- 

 ing one British species, H. (Jungermannia) 

 Hookeri, an . Alpine plant, which has been 

 carefully studied by Gottsche. It is remark- 

 able for having leaves (without amphigastres) 

 inserted on all sides of the stem. The ter- 

 minal capsule emerges at length from a large 

 oblong fleshy epigone (fig. 332). The an- 

 theridia (fig. 327) occur in the axils of the 

 leaves. They have a double coat, the inte- 

 rior of which consists of reniform cells (fig. 

 326), which become isolated and more or less 

 dissolved. The spermatozoids, produced in 

 minute vesicles (fig. 328), resemble those of 

 the Mosses. 



BIBL. Hooker, Brit.Jungermannite, pi. 54 ; 

 Ekart. Synops. Jung. pi. 8. fig. 65 ; End- 

 licher, Gen. Plant. No. 474-3; Gottsche, 

 Nova Acta, xx. p. 265. pis. 13-20. 



HAPLOTRICHUM, Link. A genus of 

 Mucedines (Hyphomyce- p- 

 tous Fungi), intermediate 

 in structure between Bo- 

 try tis and Aspergillus. 

 The spores are developed 

 from a capitate cell termi- 

 nating the septate erect 

 fertile filaments (fig. 482). /Q 



BIBL. Corda, Icon, y^f 

 Fung.-, Nees,Syst.d.Pilze, 

 pi. 4; Fries, SummaVeget. 



P- 470. Haplotrichum roseum. 



Magn. 200 diams. 



HARVEST-BUG. TROMBIDIUM au- 



tumnale. 



HASSALLIA, Berk. See SIROSIPHON. 



HAVERSIAN CANALS. See BONE. 



HEART. The muscular fibres of the 

 heart present certain peculiarities. The 

 primitive bundles are more slender than 

 usual ; they frequently anastomose, and con- 

 tain normally a few minute granules of fat ; 

 the transverse striae are also often indistinct. 

 In disease the fatty matter is often extremely 

 abundant (PL 30. fig. 14 a), and the striae 

 are more or less obliterated. 



BIBL. Kolliker, Mikroskop. Anat. ii. ; 

 Forster, Handbuch d. path. Anat.; Wedl, 

 Grundz. d. path. Histol. ; Quain, Med. Chi. 

 Trans. 33; Rokitansky, Handb. d. path. 

 Anat. 



Fig. 317. 



HEDWIGIA, Hook. A genus of Mosses. 

 See ZYGODON. 



HELICOMA, Corda. A genus of De- 

 matiei (Hyphomycetous Fungi) with the 

 spores curled into a spiral. Mr. Berkeley 

 considers the distinction between Helicoma 

 and Helicosporium scarcely tenable, and 

 Fries includes Helicoma Miilleri, Corda, 

 under Helicosporium. This plant has been 

 found on dead wood in this country. 



BIBL. Corda, Icon. Fung. i. pi. 4. fig. 219 ; 

 Berkeley and Broome, Annals Nat. Hist. 

 2nd ser. vii. 98 ; Fries, Summa Veget. p. 500. 



HELICOSPORIUM, Nees. A genus of 

 Dematiei (Hyphomycetous Fungi), growing 

 on decayed wood, nearly related to Helicoma 

 and Helicotrichum. Helicoma and Helico- 

 sporium are described as having erect fertile 

 filaments, Helicotrichum creeping branched 

 filaments, but the distinctions are obscure, 

 as also those between Helicoma and Helico - 

 sporium, the first of which should have the 

 spirals closed, the latter open. Fries and 

 Berkeley both include Helicotrichum under 

 Helicosporium. Br. species 



1. H. pulvinatum, Fr. 

 (fig.317). Formingablack- 

 ish or olive pulvinate stra- 

 tum over wood, with slen- 

 der branched filaments, 

 bearing yellowish- green 

 strings of sporidia coiled 

 up into a spiral of about 

 three turns, very fugacious 

 (Helicotrichum pulvina- 

 tum, Nees). 



2. H.vegetum,r. Wide- 

 ly pulvinate-effused, sub- Helicosporium puM- 

 olivaceous, at length black ; natum. 

 fertile filaments erect, stiff, Ma e n ; 20 diams - 

 subulate ; spores coiled into a ring, 3-sep- 

 tate, greyish green. 



BIBL. Berk. Hook. Brit. Fl. vol. ii. pt.2. 

 p. 335 ; Ann. Nat. Hist. vi. 434, 2nd ser. 

 vii. p. 98 ; Fries, Syst. Myc. iii. p. 353, 

 Summa Veg. 500 ; Corda, Sturm. Deutschl. 

 Flora, 3 ser. ii. pi. 15 & 16; Nees, Nova 

 Acta, ix. 246. pi. 5. fig. 15, Sy sterna My col. 

 p. 68. fig. 69. 



HELICOTRICHUM, Nees. See HELI- 

 COSPORIUM. 



HELIOPELTA, Ehr. A genus of Dia- 

 tomaceae. 



Char. Frustules single (?), orbicular in 

 side view, internally furnished with imper- 

 fect radiating septa, the alternate interme- 

 diate portions of the valve being depressed ; 

 valves angular and not furnished with mark- 



