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Published In: Flora 50: 181. 1867. (Flora) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 5/6/2009)
Acceptance : Accepted
Notes     (Last Modified On 10/29/2012)
general taxon notes:

Ditrichum is stated to contain 80 species of mostly temperate and subtropical regions; about 10 species in the Neotropics. A critical worldwide revision is warranted for this genus. Mid to high open montane, páramo and puna in the tropical Andes; often in moist sites, on soil or rock, or rock in streams.

 

Se considera que Ditrichum contiene 80 especies generalmente de regiones templadas y subtropicales; ca. 10 especies en el Neotrópico. En Bolivia están presentes por lo menos cinco especies. Ditrichum crinale (Taylor) Kuntze y D. difficile (Duby) M. Fleisch. son comunes en sitios secos, mientras D. gracile (Mitt.) Kuntze D. submersum Cardot & Herzog.

 

The identity of the following names yet to be determined.

 

Published nomen nudum:

Ditrichum subflexuosum Paris, Index Bryol. 396. 1896, nom. nud. Recorded from Bolivia.

 

Status unknown:

Ditrichum capillare (Müll. Hal.) Paris, Index Bryol. Suppl. 131. 1900. Leptotrichum capillare Müll. Hal., Nuovo Giorn. Bot. Ital. n. s. 4: 37. 1897. Type: Bolivia. Sin. loc. & leg. Possible type data: Cochabamba, prope Choquecamata, Germain.

 

Ditrichum levieri (Herzog) Hilp., Beih. Bot. Centralbl. 50 (2): 691. 1933. Rhamphidium levieri Herzog, Beih. Bot. Centralbl. 27(2): 350. 1910. Type: Bolivia. Auf Erde am Wegrand bei Incacorral (Prov. Cochabamba), ca. 2200 m, Januar 1908, Herzog.

Reference List     (Last Modified On 10/29/2012)
Reference:

 

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Plants medium sized, forming loose to dense tufts, glossy or dull dark green to blackish- or yellowish-brown. Stems erect, often rather slender, few to several branched by innovations; central strand present. Leaves long subulate from an ovate or oblong base, limb channeled or flat, expanded base weakly to strongly sheathing, concave or convolute; margins smooth, tips often serrate; costae single, strong, excurrent, often filling acumen; upper laminal cells of expanded base mostly thick-walled, irregularly short rectangular or subquadrate distally; lower and basal cells long and narrowly rectangular. Dioicous or autoicous. Perichaetia terminal. Setae elongate and slender, smooth. Capsules suberect, urn cylindrical, slightly asymmetric, smooth or slightly furrowed; opercula short-rostrate; peristome single, teeth 16, usually divided to near base, coarsely papillose to spiculose. Calyptrae cucullate, smooth and naked, base entire. Spores spherical, smooth or nearly so.

 

Plantas medianas, formando manojos laxos hasta densos, de color verde brillante u opaco oscuro a negruzco- o pardo-amarillento. Tallos erectos, a menudo bastante delgados, poco a muy ramificados por innovaciones; cordón central presente. Hojas largo-subuladas desde una base ovada u oblonga, limbo acanalado o plano, bases expandidas débil a marcadamente envainadoras, cóncavas o convolutas; márgenes lisos, extremos a menudo serrados; costa simple, fuerte, excurrente, a menudo llenando el acumen; células superiores de la base expandida de la lámina generalmente con paredes gruesas, irregularmente corto-rectangulares o distalmente subcuadradas; células inferiores y basales largas y angostamente rectangulares. Dioicas o autoicas. Periquecios terminales. Setas alargadas, delgadas y lisas. Cápsulas suberectas, urna cilíndrica, escasamente asimétrica, lisa o escasamente acanalada; opérculo corto-rostrado; peristoma simple, 16 dientes, generalmente partidos hasta cerca de la base, gruesamente papilosos a espiculados. Caliptra cuculada, lisa y desnuda, base entera. Esporas esféricas, lisas o casi lisas.

 

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1. Lamina sheath cells of distal 1/2-1/3 mostly isodiametric, mostly 1-3: 1 … D. gracile
1. Lamina sheath cells of distal half mostly elongate, 4-8: 1 (marginal cells often subquadrate) … 2.
2. Lamina cells of sheathing base very thick-walled, often obscure, particularly along distal margins … D. submersum
2. Laminal cells of sheathing base somewhat thin to moderately thick-walled, distinct … 3.
3. Juxtacostal cells of lower sheathing base distinctly porose … D. bogotense
3. Juxtacostal cells of lower sheathing base entire, rarely weakly porose … 4.
4. Leaves long sheathing, nearly convolute about stem, erect to loosely erect … D. crinale
4. Leaves sheathing near base, flexuose and loosely erect-spreading … D. difficile
 
1. Células de la vaina de la lámina generalmente isodiamétricas en la porción 1/2-1/3 distal, generalmente 1-3: 1 … D. gracile
1. Células de la vaina de la lámina generalmente alargadas en la mitad distal, 4-8: 1 (células marginales a menudo subcuadradas) … 2.
2. Células de la base envainadora de la lámina con paredes muy gruesas, a menudo oscuras, particularmente a lo largo márgenes en la porción distal … D. submersum
2. Células de la base envainadora de la lámina con paredes algo delgadas a moderadamente gruesas, conspicuas … 3.
3. Células yuxtacostales de la porción inferior de la base envainadora conspicuamente porosas … D. bogotense
3. Células yuxtacostales de la porción inferior de la base enteras, rara vez débilmente porosas … 4.
4. Hojas largo envainadoras, casi convolutas al tallo, erectas a laxamente erectas … D. crinale
4. Hojas envainadoras cerca de la base, flexuosas y laxamente erecto-extendidas … D. difficile

 
 
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